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ftrace: Protect direct_functions in ftrace_find_rec_direct

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Fix accessing the __rcu pointer direct_functions with RCU protection.

Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260730150411.88667-2-leon.hwang@linux.dev
Fixes: d05cb47066 ("ftrace: Fix modification of direct_function hash while in use")
Acked-by: Jiri Olsa <jolsa@kernel.org>
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Leon Hwang
2026-07-30 23:04:08 +08:00
committed by Steven Rostedt
parent f0ece16ffc
commit 63444b7617
1 changed files with 2 additions and 1 deletions
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3
kernel/trace/ftrace.c
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@@ -2645,7 +2645,8 @@ unsigned long ftrace_find_rec_direct(unsigned long ip)
{
struct ftrace_func_entry *entry;
entry = __ftrace_lookup_ip(direct_functions, ip);
guard(preempt_notrace)();
entry = __ftrace_lookup_ip(rcu_dereference_sched(direct_functions), ip);
if (!entry)
return 0;