Bug Summary

File:ui/cli/tap-flow.c
Warning:line 100, column 16
Potential leak of memory pointed to by 'flow_info'

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 tap-flow.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 -pic-is-pie -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-20/lib/clang/20 -isystem /usr/include/glib-2.0 -isystem /usr/lib/x86_64-linux-gnu/glib-2.0/include -D G_DISABLE_DEPRECATED -D G_DISABLE_SINGLE_INCLUDES -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/wiretap -D _GLIBCXX_ASSERTIONS -internal-isystem /usr/lib/llvm-20/lib/clang/20/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/2025-09-13-101102-3933-1 -x c /builds/wireshark/wireshark/ui/cli/tap-flow.c
1/* tap-flow.c
2 *
3 * Wireshark - Network traffic analyzer
4 * By Gerald Combs <[email protected]>
5 * Copyright 1998 Gerald Combs
6 *
7 * SPDX-License-Identifier: GPL-2.0-or-later
8 */
9
10/* This module provides udp and tcp follow stream capabilities to tshark.
11 * It is only used by tshark and not wireshark.
12 */
13
14#include "config.h"
15
16#include <stdio.h>
17#include <stdlib.h>
18
19#include <epan/sequence_analysis.h>
20#include <epan/stat_tap_ui.h>
21#include <epan/tap.h>
22#include <wsutil/cmdarg_err.h>
23
24void register_tap_listener_flow(void);
25
26#define STR_FLOW"flow," "flow,"
27#define STR_STANDARD",standard" ",standard"
28#define STR_NETWORK",network" ",network"
29
30static void
31flow_draw(void *arg)
32{
33 seq_analysis_info_t* flow_info = (seq_analysis_info_t*)arg;
34
35 sequence_analysis_get_nodes(flow_info);
36
37 sequence_analysis_dump_to_file(stdoutstdout, flow_info, 0);
38}
39
40static void
41flow_finish(void *arg)
42{
43 seq_analysis_info_t* flow_info = (seq_analysis_info_t*)arg;
44 //clean up the data
45 sequence_analysis_list_free(flow_info);
46 sequence_analysis_info_free(flow_info);
47}
48
49static void
50flow_reset(void *arg)
51{
52 seq_analysis_info_t* flow_info = (seq_analysis_info_t*)arg;
53 sequence_analysis_list_free(flow_info);
54}
55
56static bool_Bool flow_arg_strncmp(const char **opt_argp, const char *strp)
57{
58 size_t len = strlen(strp);
59
60 if (strncmp(*opt_argp, strp, len) == 0)
61 {
62 *opt_argp += len;
63 return true1;
64 }
65 return false0;
66}
67
68static bool_Bool
69flow_arg_mode(const char **opt_argp, seq_analysis_info_t *flow_info)
70{
71 if (flow_arg_strncmp(opt_argp, STR_STANDARD",standard"))
72 {
73 flow_info->any_addr = 1;
74 }
75 else if (flow_arg_strncmp(opt_argp, STR_NETWORK",network"))
76 {
77 flow_info->any_addr = 0;
78 }
79 else
80 {
81 cmdarg_err("Invalid address type.");
82 return false0;
83 }
84
85 return true1;
86}
87
88static bool_Bool
89flow_init(const char *opt_argp, void *userdata)
90{
91 seq_analysis_info_t *flow_info = g_new0(seq_analysis_info_t, 1)((seq_analysis_info_t *) g_malloc0_n ((1), sizeof (seq_analysis_info_t
)));
1
Memory is allocated
→
92 GString *errp;
93 register_analysis_t* analysis = (register_analysis_t*)userdata;
94 const char *filter=NULL((void*)0);
95
96 opt_argp += strlen(STR_FLOW"flow,");
97 opt_argp += strlen(sequence_analysis_get_name(analysis));
98
99 if (!flow_arg_mode(&opt_argp, flow_info))
2
←
Taking true branch
→
100 return false0;
3
←
Potential leak of memory pointed to by 'flow_info'
101
102 if (*opt_argp == ',') {
103 filter = opt_argp + 1;
104 }
105
106 sequence_analysis_list_free(flow_info);
107
108 errp = register_tap_listener(sequence_analysis_get_tap_listener_name(analysis), flow_info, filter, sequence_analysis_get_tap_flags(analysis),
109 flow_reset, sequence_analysis_get_packet_func(analysis), flow_draw, flow_finish);
110
111 if (errp != NULL((void*)0))
112 {
113 sequence_analysis_list_free(flow_info);
114 sequence_analysis_info_free(flow_info);
115 cmdarg_err("Couldn't register %s tap: %s",
116 sequence_analysis_get_tap_listener_name(analysis), errp->str);
117 g_string_free(errp, TRUE)(__builtin_constant_p ((!(0))) ? (((!(0))) ? (g_string_free) (
(errp), ((!(0)))) : g_string_free_and_steal (errp)) : (g_string_free
) ((errp), ((!(0)))));
118 return false0;
119 }
120
121 return true1;
122}
123
124static bool_Bool
125flow_register(const void *key _U___attribute__((unused)), void *value, void *userdata _U___attribute__((unused)))
126{
127 register_analysis_t* analysis = (register_analysis_t*)value;
128 stat_tap_ui flow_ui;
129 GString *cmd_str = g_string_new(STR_FLOW"flow,");
130 char *cli_string;
131
132 g_string_append(cmd_str, sequence_analysis_get_name(analysis))(__builtin_constant_p (sequence_analysis_get_name(analysis)) ?
__extension__ ({ const char * const __val = (sequence_analysis_get_name
(analysis)); g_string_append_len_inline (cmd_str, __val, (__val
!= ((void*)0)) ? (gssize) strlen (((__val) + !(__val))) : (gssize
) -1); }) : g_string_append_len_inline (cmd_str, sequence_analysis_get_name
(analysis), (gssize) -1));
133 cli_string = g_string_free(cmd_str, FALSE)(__builtin_constant_p ((0)) ? (((0)) ? (g_string_free) ((cmd_str
), ((0))) : g_string_free_and_steal (cmd_str)) : (g_string_free
) ((cmd_str), ((0))));
134
135 flow_ui.group = REGISTER_STAT_GROUP_GENERIC;
136 flow_ui.title = NULL((void*)0); /* construct this from the protocol info? */
137 flow_ui.cli_string = cli_string;
138 flow_ui.tap_init_cb = flow_init;
139 flow_ui.nparams = 0;
140 flow_ui.params = NULL((void*)0);
141 register_stat_tap_ui(&flow_ui, analysis);
142 g_free(cli_string);
143 return false0;
144}
145
146void
147register_tap_listener_flow(void)
148{
149 sequence_analysis_table_iterate_tables(flow_register, NULL((void*)0));
150}
151
152/*
153 * Editor modelines - https://www.wireshark.org/tools/modelines.html
154 *
155 * Local Variables:
156 * c-basic-offset: 4
157 * tab-width: 8
158 * indent-tabs-mode: nil
159 * End:
160 *
161 * ex: set shiftwidth=2 tabstop=8 expandtab:
162 * :indentSize=2:tabSize=8:noTabs=true:
163 */