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tracing/eprobe: Fix exact system name matching in eprobe_dyn_event_match()

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eprobe_dyn_event_match() checks if the target event system in argv[0]
matches ep->event_system using strncmp(ep->event_system, argv[0], len).
However, if ep->event_system is longer than len (e.g. "eprobes" vs
"ep/event"), strncmp() still returns 0 because the first len characters
match.

Check that ep->event_system[len] is '\0' to ensure exact system name
matching.

Link: https://lore.kernel.org/all/178454235856.290363.14872590900774231133.stgit@devnote2/

Fixes: 7d5fda1c84 ("tracing: Fix event probe removal from dynamic events")
Cc: stable@vger.kernel.org
Assisted-by: Antigravity:gemini-3.5-flash
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
This commit is contained in:
Masami Hiramatsu (Google)
2026-07-20 19:12:38 +09:00
parent 8ce20bfba4
commit f418d68d71
1 changed files with 2 additions and 1 deletions
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3
kernel/trace/trace_eprobe.c
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@@ -172,7 +172,8 @@ static bool eprobe_dyn_event_match(const char *system, const char *event,
if (!slash)
return false;
if (strncmp(ep->event_system, argv[0], slash - argv[0]))
if (strncmp(ep->event_system, argv[0], slash - argv[0]) ||
ep->event_system[slash - argv[0]] != '\0')
return false;
if (strcmp(ep->event_name, slash + 1))
return false;