### Bug Summary

File: | builds/wireshark/wireshark/epan/dfilter/sttype-op.c
Warning: | line 74, column 14 Value stored to 's' during its initialization is never read

### Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name sttype-op.c -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 2 -fhalf-no-semantic-interposition -fno-delete-null-pointer-checks -mframe-pointer=all -relaxed-aliasing -fmath-errno -ffp-contract=on -fno-rounding-math -ffloat16-excess-precision=fast -fbfloat16-excess-precision=fast -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/builds/wireshark/wireshark/build -fcoverage-compilation-dir=/builds/wireshark/wireshark/build -resource-dir /usr/lib/llvm-22/lib/clang/22 -isystem /usr/include/glib-2.0 -isystem /usr/lib/x86_64-linux-gnu/glib-2.0/include -D CARES_NO_DEPRECATED -D G_DISABLE_DEPRECATED -D G_DISABLE_SINGLE_INCLUDES -D WS_BUILD_DLL -D WS_DEBUG -D WS_DEBUG_UTF_8 -I /builds/wireshark/wireshark/build -I /builds/wireshark/wireshark -I /builds/wireshark/wireshark/include -I /builds/wireshark/wireshark/epan/dfilter -I /builds/wireshark/wireshark/build/epan/dfilter -I /builds/wireshark/wireshark/epan -I /builds/wireshark/wireshark/tools/lemon -D _GLIBCXX_ASSERTIONS -internal-isystem /usr/lib/llvm-22/lib/clang/22/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/16/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fmacro-prefix-map=/builds/wireshark/wireshark/= -fmacro-prefix-map=/builds/wireshark/wireshark/build/= -fmacro-prefix-map=../= -Wno-format-nonliteral -std=gnu17 -ferror-limit 19 -fvisibility=hidden -fwrapv -fwrapv-pointer -fstrict-flex-arrays=3 -stack-protector 2 -fstack-clash-protection -fcf-protection=full -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fexceptions -fcolor-diagnostics -analyzer-output=html -faddrsig -fdwarf2-cfi-asm -o /builds/wireshark/wireshark/sbout/2026-07-20-100411-3661-1 -x c /builds/wireshark/wireshark/epan/dfilter/sttype-op.c

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1 | /*
2 | * Wireshark - Network traffic analyzer
3 | * By Gerald Combs <gerald@wireshark.org>
4 | * Copyright 2001 Gerald Combs
5 | *
6 | *
7 | * SPDX-License-Identifier: GPL-2.0-or-later
8 | */
9 |
10 | #include "syntax-tree.h"
11 | #include "sttype-op.h"
12 |
13 | typedef struct {
14 | uint32_t magic;
15 | stnode_op_t op;
16 | stmatch_t how;
17 | stnode_t *val1;
18 | stnode_t *val2;
19 | } oper_t;
20 |
21 | #define OPER_MAGIC0xab9009ba 0xab9009ba
22 |
23 | static void *
24 | oper_new(void *junk _U___attribute__((unused)))
25 | {
26 | oper_t *oper;
27 |
28 | ws_assert(junk == NULL)do { if ((1) && !(junk == ((void*)0))) ws_log_fatal_full ("", LOG_LEVEL_ERROR, "epan/dfilter/sttype-op.c", 28, __func__ , "assertion failed: %s", "junk == ((void*)0)"); } while (0);
29 |
30 | oper = g_new(oper_t, 1)((oper_t *) g_malloc_n ((1), sizeof (oper_t)));
31 |
32 | oper->magic = OPER_MAGIC0xab9009ba;
33 | oper->op = STNODE_OP_UNINITIALIZED;
34 | oper->how = STNODE_MATCH_DEF;
35 | oper->val1 = NULL((void*)0);
36 | oper->val2 = NULL((void*)0);
37 |
38 | return oper;
39 | }
40 |
41 | static void *
42 | oper_dup(const void *data)
43 | {
44 | const oper_t *org = data;
45 | oper_t *oper;
46 |
47 | oper = oper_new(NULL((void*)0));
48 | oper->op = org->op;
49 | oper->how = org->how;
50 | oper->val1 = stnode_dup(org->val1);
51 | if (org->val2)
52 | oper->val2 = stnode_dup(org->val2);
53 |
54 | return oper;
55 | }
56 |
57 | static void
58 | oper_free(void *value)
59 | {
60 | oper_t *oper = value;
61 | ws_assert_magic(oper, OPER_MAGIC)do { do { if ((1) && !(oper)) ws_log_fatal_full("", LOG_LEVEL_ERROR , "epan/dfilter/sttype-op.c", 61, __func__, "assertion failed: %s" , "oper"); } while (0); if ((oper)->magic != (0xab9009ba)) { ws_log_full("DFilter", LOG_LEVEL_ERROR, "epan/dfilter/sttype-op.c" , 61, __func__, "Magic num is 0x%08" "x"", " "but should be 0x%08" "x", (oper)->magic, (0xab9009ba)); } } while(0);
62 |
63 | if (oper->val1)
64 | stnode_free(oper->val1);
65 | if (oper->val2)
66 | stnode_free(oper->val2);
67 |
68 | g_free(oper)(__builtin_object_size ((oper), 0) != ((size_t) - 1)) ? g_free_sized (oper, __builtin_object_size ((oper), 0)) : (g_free) (oper);
69 | }
70 |
71 | static char *
72 | oper_todisplay(const oper_t *oper)
73 | {
74 | const char *s = "(notset)";
| Value stored to 's' during its initialization is never read
75 |
76 | switch(oper->op) {
77 | case STNODE_OP_NOT:
78 | s = "!";
79 | break;
80 | case STNODE_OP_AND:
81 | s = "&&";
82 | break;
83 | case STNODE_OP_OR:
84 | s = "||";
85 | break;
86 | case STNODE_OP_ALL_EQ:
87 | s = "===";
88 | break;
89 | case STNODE_OP_ANY_EQ:
90 | s = "==";
91 | break;
92 | case STNODE_OP_ALL_NE:
93 | s = "!=";
94 | break;
95 | case STNODE_OP_ANY_NE:
96 | s = "~=";
97 | break;
98 | case STNODE_OP_GT:
99 | s = ">";
100 | break;
101 | case STNODE_OP_GE:
102 | s = ">=";
103 | break;
104 | case STNODE_OP_LT:
105 | s = "<";
106 | break;
107 | case STNODE_OP_LE:
108 | s = "<=";
109 | break;
110 | case STNODE_OP_BITWISE_AND:
111 | s = "&";
112 | break;
113 | case STNODE_OP_ADD:
114 | s = "+";
115 | break;
116 | case STNODE_OP_UNARY_MINUS:
117 | case STNODE_OP_SUBTRACT:
118 | s = "-";
119 | break;
120 | case STNODE_OP_MULTIPLY:
121 | s = "*";
122 | break;
123 | case STNODE_OP_DIVIDE:
124 | s = "/";
125 | break;
126 | case STNODE_OP_MODULO:
127 | s = "%";
128 | break;
129 | case STNODE_OP_CONTAINS:
130 | s = "contains";
131 | break;
132 | case STNODE_OP_MATCHES:
133 | s = "matches";
134 | break;
135 | case STNODE_OP_IN:
136 | s = "in";
137 | break;
138 | case STNODE_OP_NOT_IN:
139 | s = "not in";
140 | break;
141 | case STNODE_OP_UNINITIALIZED:
142 | s = "(uninitialized)";
143 | break;
144 | }
145 | return g_strdup(s)g_strdup_inline (s);
146 | }
147 |
148 | static char *
149 | oper_todebug(const oper_t *oper)
150 | {
151 | const char *s = stnode_op_name(oper->op);
152 | if (oper->how == STNODE_MATCH_ALL)
153 | return ws_strdup_printf("ALL %s", s)wmem_strdup_printf(((void*)0), "ALL %s", s);
154 | if (oper->how == STNODE_MATCH_ANY)
155 | return ws_strdup_printf("ANY %s", s)wmem_strdup_printf(((void*)0), "ANY %s", s);
156 | return ws_strdup(s)wmem_strdup(((void*)0), s);
157 | }
158 |
159 | static char *
160 | oper_tostr(const void *value, bool_Bool pretty)
161 | {
162 | const oper_t *oper = value;
163 | ws_assert_magic(oper, OPER_MAGIC)do { do { if ((1) && !(oper)) ws_log_fatal_full("", LOG_LEVEL_ERROR , "epan/dfilter/sttype-op.c", 163, __func__, "assertion failed: %s" , "oper"); } while (0); if ((oper)->magic != (0xab9009ba)) { ws_log_full("DFilter", LOG_LEVEL_ERROR, "epan/dfilter/sttype-op.c" , 163, __func__, "Magic num is 0x%08" "x"", " "but should be 0x%08" "x", (oper)->magic, (0xab9009ba)); } } while(0);
164 |
165 | if (pretty)
166 | return oper_todisplay(oper);
167 | return oper_todebug(oper);
168 | }
169 |
170 | static int
171 | num_operands(stnode_op_t op)
172 | {
173 | switch(op) {
174 | case STNODE_OP_NOT:
175 | case STNODE_OP_UNARY_MINUS:
176 | return 1;
177 | case STNODE_OP_AND:
178 | case STNODE_OP_OR:
179 | case STNODE_OP_ALL_EQ:
180 | case STNODE_OP_ANY_EQ:
181 | case STNODE_OP_ALL_NE:
182 | case STNODE_OP_ANY_NE:
183 | case STNODE_OP_GT:
184 | case STNODE_OP_GE:
185 | case STNODE_OP_LT:
186 | case STNODE_OP_LE:
187 | case STNODE_OP_BITWISE_AND:
188 | case STNODE_OP_ADD:
189 | case STNODE_OP_SUBTRACT:
190 | case STNODE_OP_MULTIPLY:
191 | case STNODE_OP_DIVIDE:
192 | case STNODE_OP_MODULO:
193 | case STNODE_OP_CONTAINS:
194 | case STNODE_OP_MATCHES:
195 | case STNODE_OP_IN:
196 | case STNODE_OP_NOT_IN:
197 | return 2;
198 | case STNODE_OP_UNINITIALIZED:
199 | ASSERT_STNODE_OP_NOT_REACHED(op)ws_log_fatal_full("", LOG_LEVEL_ERROR, "epan/dfilter/sttype-op.c" , 199, __func__, "Invalid stnode op '%s'.", stnode_op_name(op ));
200 | }
201 |
202 | ws_assert_not_reached()ws_log_fatal_full("", LOG_LEVEL_ERROR, "epan/dfilter/sttype-op.c" , 202, __func__, "assertion \"not reached\" failed");
203 | }
204 |
205 |
206 | void
207 | sttype_oper_set1(stnode_t *node, stnode_op_t op, stnode_t *val1)
208 | {
209 | oper_t *oper = stnode_data(node);
210 | ws_assert_magic(oper, OPER_MAGIC)do { do { if ((1) && !(oper)) ws_log_fatal_full("", LOG_LEVEL_ERROR , "epan/dfilter/sttype-op.c", 210, __func__, "assertion failed: %s" , "oper"); } while (0); if ((oper)->magic != (0xab9009ba)) { ws_log_full("DFilter", LOG_LEVEL_ERROR, "epan/dfilter/sttype-op.c" , 210, __func__, "Magic num is 0x%08" "x"", " "but should be 0x%08" "x", (oper)->magic, (0xab9009ba)); } } while(0);
211 |
212 | ws_assert(num_operands(op) == 1)do { if ((1) && !(num_operands(op) == 1)) ws_log_fatal_full ("", LOG_LEVEL_ERROR, "epan/dfilter/sttype-op.c", 212, __func__ , "assertion failed: %s", "num_operands(op) == 1"); } while ( 0);
213 | oper->op = op;
214 | oper->val1 = val1;
215 | oper->val2 = NULL((void*)0);
216 | }
217 |
218 | void
219 | sttype_oper_set2(stnode_t *node, stnode_op_t op, stnode_t *val1, stnode_t *val2)
220 | {
221 | oper_t *oper = stnode_data(node);
222 | ws_assert_magic(oper, OPER_MAGIC)do { do { if ((1) && !(oper)) ws_log_fatal_full("", LOG_LEVEL_ERROR , "epan/dfilter/sttype-op.c", 222, __func__, "assertion failed: %s" , "oper"); } while (0); if ((oper)->magic != (0xab9009ba)) { ws_log_full("DFilter", LOG_LEVEL_ERROR, "epan/dfilter/sttype-op.c" , 222, __func__, "Magic num is 0x%08" "x"", " "but should be 0x%08" "x", (oper)->magic, (0xab9009ba)); } } while(0);
223 |
224 | ws_assert(num_operands(op) == 2)do { if ((1) && !(num_operands(op) == 2)) ws_log_fatal_full ("", LOG_LEVEL_ERROR, "epan/dfilter/sttype-op.c", 224, __func__ , "assertion failed: %s", "num_operands(op) == 2"); } while ( 0);
225 | oper->op = op;
226 | oper->val1 = val1;
227 | oper->val2 = val2;
228 | }
229 |
230 | void
231 | sttype_oper_set1_args(stnode_t *node, stnode_t *val1)
232 | {
233 | oper_t *oper;
234 |
235 | oper = (oper_t*)stnode_data(node);
236 | ws_assert_magic(oper, OPER_MAGIC)do { do { if ((1) && !(oper)) ws_log_fatal_full("", LOG_LEVEL_ERROR , "epan/dfilter/sttype-op.c", 236, __func__, "assertion failed: %s" , "oper"); } while (0); if ((oper)->magic != (0xab9009ba)) { ws_log_full("DFilter", LOG_LEVEL_ERROR, "epan/dfilter/sttype-op.c" , 236, __func__, "Magic num is 0x%08" "x"", " "but should be 0x%08" "x", (oper)->magic, (0xab9009ba)); } } while(0);
237 |
238 | ws_assert(num_operands(oper->op) == 1)do { if ((1) && !(num_operands(oper->op) == 1)) ws_log_fatal_full ("", LOG_LEVEL_ERROR, "epan/dfilter/sttype-op.c", 238, __func__ , "assertion failed: %s", "num_operands(oper->op) == 1"); } while (0);
239 | oper->val1 = val1;
240 | oper->val2 = NULL((void*)0);
241 | }
242 |
243 | void
244 | sttype_oper_set2_args(stnode_t *node, stnode_t *val1, stnode_t *val2)
245 | {
246 | oper_t *oper;
247 |
248 | oper = (oper_t*)stnode_data(node);
249 | ws_assert_magic(oper, OPER_MAGIC)do { do { if ((1) && !(oper)) ws_log_fatal_full("", LOG_LEVEL_ERROR , "epan/dfilter/sttype-op.c", 249, __func__, "assertion failed: %s" , "oper"); } while (0); if ((oper)->magic != (0xab9009ba)) { ws_log_full("DFilter", LOG_LEVEL_ERROR, "epan/dfilter/sttype-op.c" , 249, __func__, "Magic num is 0x%08" "x"", " "but should be 0x%08" "x", (oper)->magic, (0xab9009ba)); } } while(0);
250 |
251 | ws_assert(num_operands(oper->op) == 2)do { if ((1) && !(num_operands(oper->op) == 2)) ws_log_fatal_full ("", LOG_LEVEL_ERROR, "epan/dfilter/sttype-op.c", 251, __func__ , "assertion failed: %s", "num_operands(oper->op) == 2"); } while (0);
252 | oper->val1 = val1;
253 | oper->val2 = val2;
254 | }
255 |
256 | void
257 | sttype_oper_set_op(stnode_t *node, stnode_op_t op)
258 | {
259 | oper_t *oper = stnode_data(node);
260 | ws_assert_magic(oper, OPER_MAGIC)do { do { if ((1) && !(oper)) ws_log_fatal_full("", LOG_LEVEL_ERROR , "epan/dfilter/sttype-op.c", 260, __func__, "assertion failed: %s" , "oper"); } while (0); if ((oper)->magic != (0xab9009ba)) { ws_log_full("DFilter", LOG_LEVEL_ERROR, "epan/dfilter/sttype-op.c" , 260, __func__, "Magic num is 0x%08" "x"", " "but should be 0x%08" "x", (oper)->magic, (0xab9009ba)); } } while(0);
261 | ws_assert(oper->op == STNODE_OP_UNINITIALIZED)do { if ((1) && !(oper->op == STNODE_OP_UNINITIALIZED )) ws_log_fatal_full("", LOG_LEVEL_ERROR, "epan/dfilter/sttype-op.c" , 261, __func__, "assertion failed: %s", "oper->op == STNODE_OP_UNINITIALIZED" ); } while (0);
262 | oper->op = op;
263 | }
264 |
265 | stnode_op_t
266 | sttype_oper_get_op(stnode_t *node)
267 | {
268 | oper_t *oper = stnode_data(node);
269 | ws_assert_magic(oper, OPER_MAGIC)do { do { if ((1) && !(oper)) ws_log_fatal_full("", LOG_LEVEL_ERROR , "epan/dfilter/sttype-op.c", 269, __func__, "assertion failed: %s" , "oper"); } while (0); if ((oper)->magic != (0xab9009ba)) { ws_log_full("DFilter", LOG_LEVEL_ERROR, "epan/dfilter/sttype-op.c" , 269, __func__, "Magic num is 0x%08" "x"", " "but should be 0x%08" "x", (oper)->magic, (0xab9009ba)); } } while(0);
270 | return oper->op;
271 | }
272 |
273 | void
274 | sttype_oper_get(stnode_t *node, stnode_op_t *p_op, stnode_t **p_val1, stnode_t **p_val2)
275 | {
276 | oper_t *oper = stnode_data(node);
277 | ws_assert_magic(oper, OPER_MAGIC)do { do { if ((1) && !(oper)) ws_log_fatal_full("", LOG_LEVEL_ERROR , "epan/dfilter/sttype-op.c", 277, __func__, "assertion failed: %s" , "oper"); } while (0); if ((oper)->magic != (0xab9009ba)) { ws_log_full("DFilter", LOG_LEVEL_ERROR, "epan/dfilter/sttype-op.c" , 277, __func__, "Magic num is 0x%08" "x"", " "but should be 0x%08" "x", (oper)->magic, (0xab9009ba)); } } while(0);
278 |
279 | if (p_op)
280 | *p_op = oper->op;
281 | if (p_val1)
282 | *p_val1 = oper->val1;
283 | if (p_val2)
284 | *p_val2 = oper->val2;
285 | }
286 |
287 | void
288 | sttype_test_set_match(stnode_t *node, stmatch_t how)
289 | {
290 | oper_t *oper = stnode_data(node);
291 | ws_assert_magic(oper, OPER_MAGIC)do { do { if ((1) && !(oper)) ws_log_fatal_full("", LOG_LEVEL_ERROR , "epan/dfilter/sttype-op.c", 291, __func__, "assertion failed: %s" , "oper"); } while (0); if ((oper)->magic != (0xab9009ba)) { ws_log_full("DFilter", LOG_LEVEL_ERROR, "epan/dfilter/sttype-op.c" , 291, __func__, "Magic num is 0x%08" "x"", " "but should be 0x%08" "x", (oper)->magic, (0xab9009ba)); } } while(0);
292 | oper->how = how;
293 | }
294 |
295 | stmatch_t
296 | sttype_test_get_match(stnode_t *node)
297 | {
298 | oper_t *oper = stnode_data(node);
299 | ws_assert_magic(oper, OPER_MAGIC)do { do { if ((1) && !(oper)) ws_log_fatal_full("", LOG_LEVEL_ERROR , "epan/dfilter/sttype-op.c", 299, __func__, "assertion failed: %s" , "oper"); } while (0); if ((oper)->magic != (0xab9009ba)) { ws_log_full("DFilter", LOG_LEVEL_ERROR, "epan/dfilter/sttype-op.c" , 299, __func__, "Magic num is 0x%08" "x"", " "but should be 0x%08" "x", (oper)->magic, (0xab9009ba)); } } while(0);
300 | return oper->how;
301 | }
302 |
303 | void
304 | sttype_register_opers(void)
305 | {
306 | static sttype_t test_type = {
307 | STTYPE_TEST,
308 | oper_new,
309 | oper_free,
310 | oper_dup,
311 | oper_tostr
312 | };
313 | static sttype_t arithmetic_type = {
314 | STTYPE_ARITHMETIC,
315 | oper_new,
316 | oper_free,
317 | oper_dup,
318 | oper_tostr
319 | };
320 |
321 | sttype_register(&test_type);
322 | sttype_register(&arithmetic_type);
323 | }
324 |
325 | /*
326 | * Editor modelines - https://www.wireshark.org/tools/modelines.html
327 | *
328 | * Local variables:
329 | * c-basic-offset: 8
330 | * tab-width: 8
331 | * indent-tabs-mode: t
332 | * End:
333 | *
334 | * vi: set shiftwidth=8 tabstop=8 noexpandtab:
335 | * :indentSize=8:tabSize=8:noTabs=false:
336 | */