### Bug Summary

File: | epan/tvbuff_snappy.c
Warning: | line 48, column 25 Potential leak of memory pointed to by 'decompressed_buffer'

### 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 tvbuff_snappy.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-21/lib/clang/21 -isystem /usr/include/glib-2.0 -isystem /usr/lib/x86_64-linux-gnu/glib-2.0/include -isystem /builds/wireshark/wireshark/epan -isystem /builds/wireshark/wireshark/build/epan -isystem /usr/include/mit-krb5 -isystem /usr/include/libxml2 -isystem /usr/include/lua5.4 -D G_DISABLE_DEPRECATED -D G_DISABLE_SINGLE_INCLUDES -D WS_BUILD_DLL -D WS_DEBUG -D WS_DEBUG_UTF_8 -D epan_EXPORTS -I /builds/wireshark/wireshark/build -I /builds/wireshark/wireshark -I /builds/wireshark/wireshark/include -I /builds/wireshark/wireshark/wiretap -D _GLIBCXX_ASSERTIONS -internal-isystem /usr/lib/llvm-21/lib/clang/21/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../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-truncation -Wno-format-nonliteral -Wno-pointer-sign -std=gnu11 -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 -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /builds/wireshark/wireshark/sbout/2025-10-13-100350-3623-1 -x c /builds/wireshark/wireshark/epan/tvbuff_snappy.c

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1 | /* tvbuff_snappy.c
2 | *
3 | * Wireshark - Network traffic analyzer
4 | * By Gerald Combs <gerald@wireshark.org>
5 | * Copyright 1998 Gerald Combs
6 | *
7 | * SPDX-License-Identifier: GPL-2.0-or-later
8 | */
9 |
10 | #include <config.h>
11 |
12 | #ifdef HAVE_SNAPPY1
13 | #include <snappy-c.h>
14 | #endif
15 |
16 | #include "tvbuff.h"
17 |
18 | #ifdef HAVE_SNAPPY1
19 |
20 | /*
21 | * Uncompresses a snappy compressed packet inside a message of tvb at offset with
22 | * length comprlen. Returns an uncompressed tvbuffer if uncompression
23 | * succeeded or NULL if uncompression failed.
24 | */
25 |
26 | tvbuff_t *
27 | tvb_uncompress_snappy(tvbuff_t *tvb, const int offset, int comprlen)
28 | {
29 | tvbuff_t *uncompr_tvb = NULL((void*)0);
30 | unsigned char *decompressed_buffer = NULL((void*)0);
31 | size_t orig_size = 0;
32 | snappy_status ret;
33 | const void *compr_ptr;
34 |
35 | if (tvb == NULL((void*)0) || comprlen <= 0 || comprlen > tvb_captured_length_remaining(tvb, offset)) {
2 | ← | Assuming 'tvb' is not equal to NULL | →
3 | ← | Assuming 'comprlen' is > 0 | →
4 | ← | Assuming the condition is false | →
5 | ← | Taking false branch | →
36 | return NULL((void*)0);
37 | }
38 |
39 | compr_ptr = tvb_get_ptr(tvb, offset, comprlen);
40 | ret = snappy_uncompressed_length(compr_ptr, comprlen, &orig_size);
41 |
42 | if (ret == SNAPPY_OK) {
6 | ← | Assuming 'ret' is equal to SNAPPY_OK | →
7 | ← | Taking true branch | →
43 | decompressed_buffer = (unsigned char *)g_malloc(orig_size);
8 | ← | Memory is allocated | →
44 |
45 | ret = snappy_uncompress(compr_ptr, comprlen, decompressed_buffer, &orig_size);
46 |
47 | if (ret == SNAPPY_OK) {
9 | ← | Assuming 'ret' is equal to SNAPPY_OK | →
10 | ← | Taking true branch | →
48 | uncompr_tvb = tvb_new_real_data(decompressed_buffer, (uint32_t)orig_size, (uint32_t)orig_size);
11 | ← | Potential leak of memory pointed to by 'decompressed_buffer'
49 | tvb_set_free_cb(uncompr_tvb, g_free);
50 | } else {
51 | g_free(decompressed_buffer);
52 | }
53 | }
54 |
55 | return uncompr_tvb;
56 | }
57 | #else
58 | tvbuff_t *
59 | tvb_uncompress_snappy(tvbuff_t *tvb _U___attribute__((unused)), const int offset _U___attribute__((unused)), int comprlen _U___attribute__((unused)))
60 | {
61 | return NULL((void*)0);
62 | }
63 | #endif
64 |
65 | tvbuff_t *
66 | tvb_child_uncompress_snappy(tvbuff_t *parent, tvbuff_t *tvb, const int offset, int comprlen)
67 | {
68 | tvbuff_t *new_tvb = tvb_uncompress_snappy(tvb, offset, comprlen);
1 | Calling 'tvb_uncompress_snappy' | →
69 | if (new_tvb)
70 | tvb_set_child_real_data_tvbuff(parent, new_tvb);
71 | return new_tvb;
72 | }
73 |
74 | /*
75 | * Editor modelines - https://www.wireshark.org/tools/modelines.html
76 | *
77 | * Local variables:
78 | * c-basic-offset: 4
79 | * tab-width: 8
80 | * indent-tabs-mode: nil
81 | * End:
82 | *
83 | * vi: set shiftwidth=4 tabstop=8 expandtab:
84 | * :indentSize=4:tabSize=8:noTabs=true:
85 | */