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tools resolve_btfids: Add size check to get_id function

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To make sure we don't crash on malformed symbols.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200825192124.710397-2-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2020-08-25 21:21:11 +02:00 committed by Alexei Starovoitov
parent 2532f849b5
commit 193a983c5b
1 changed files with 8 additions and 1 deletions
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9
tools/bpf/resolve_btfids/main.c
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@ -199,9 +199,16 @@ static char *get_id(const char *prefix_end)
/*
* __BTF_ID__func__vfs_truncate__0
* prefix_end = ^
* pos = ^
*/
char *p, *id = strdup(prefix_end + sizeof("__") - 1);
int len = strlen(prefix_end);
int pos = sizeof("__") - 1;
char *p, *id;
if (pos >= len)
return NULL;
id = strdup(prefix_end + pos);
if (id) {
/*
* __BTF_ID__func__vfs_truncate__0