diff mbox series

[for-linus,1/6] tracing: Fix NULL pointer dereference in start_creating

Message ID 20210805154935.553422403@goodmis.org
State Accepted
Commit ff41c28c4b54052942180d8b3f49e75f1445135a
Headers show
Series [for-linus,1/6] tracing: Fix NULL pointer dereference in start_creating | expand

Commit Message

Steven Rostedt Aug. 5, 2021, 3:43 p.m. UTC 
From: Kamal Agrawal <kamaagra@codeaurora.org>

The event_trace_add_tracer() can fail. In this case, it leads to a crash
in start_creating with below call stack. Handle the error scenario
properly in trace_array_create_dir.

Call trace:
down_write+0x7c/0x204
start_creating.25017+0x6c/0x194
tracefs_create_file+0xc4/0x2b4
init_tracer_tracefs+0x5c/0x940
trace_array_create_dir+0x58/0xb4
trace_array_create+0x1bc/0x2b8
trace_array_get_by_name+0xdc/0x18c

Link: https://lkml.kernel.org/r/1627651386-21315-1-git-send-email-kamaagra@codeaurora.org

Cc: stable@vger.kernel.org
Fixes: 4114fbfd02f1 ("tracing: Enable creating new instance early boot")
Signed-off-by: Kamal Agrawal <kamaagra@codeaurora.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 kernel/trace/trace.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index c59dd35a6da5..33899a71fdc1 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -9135,8 +9135,10 @@  static int trace_array_create_dir(struct trace_array *tr)
 		return -EINVAL;
 
 	ret = event_trace_add_tracer(tr->dir, tr);
-	if (ret)
+	if (ret) {
 		tracefs_remove(tr->dir);
+		return ret;
+	}
 
 	init_tracer_tracefs(tr, tr->dir);
 	__update_tracer_options(tr);