To make sure we don't crash on malformed symbols.
Acked-by: Andrii Nakryiko <andriin@xxxxxx>
Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
---
tools/bpf/resolve_btfids/main.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/tools/bpf/resolve_btfids/main.c b/tools/bpf/resolve_btfids/main.c
index 52d883325a23..b83369887df6 100644
--- a/tools/bpf/resolve_btfids/main.c
+++ b/tools/bpf/resolve_btfids/main.c
@@ -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
--
2.25.4
