* [PATCH] tracing: Fix NULL pointer dereference in start_creating
@ 2021-07-30 13:23 Kamal Agrawal
2021-07-30 22:41 ` Steven Rostedt
0 siblings, 1 reply; 2+ messages in thread
From: Kamal Agrawal @ 2021-07-30 13:23 UTC (permalink / raw)
To: rostedt, mingo, linux-kernel, mhiramat; +Cc: linux-arm-msm
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
Fixes: 4114fbfd
Signed-off-by: Kamal Agrawal <kamaagra@codeaurora.org>
---
kernel/trace/trace.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index c59dd35..33899a7 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);
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation.
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] tracing: Fix NULL pointer dereference in start_creating
2021-07-30 13:23 [PATCH] tracing: Fix NULL pointer dereference in start_creating Kamal Agrawal
@ 2021-07-30 22:41 ` Steven Rostedt
0 siblings, 0 replies; 2+ messages in thread
From: Steven Rostedt @ 2021-07-30 22:41 UTC (permalink / raw)
To: Kamal Agrawal; +Cc: mingo, linux-kernel, mhiramat, linux-arm-msm
On Fri, 30 Jul 2021 18:53:06 +0530
Kamal Agrawal <kamaagra@codeaurora.org> wrote:
> 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
>
> Fixes: 4114fbfd
Thanks, I'll queue this up.
-- Steve
> Signed-off-by: Kamal Agrawal <kamaagra@codeaurora.org>
> ---
> kernel/trace/trace.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index c59dd35..33899a7 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);
^ permalink raw reply [flat|nested] 2+ messages in thread
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2021-07-30 13:23 [PATCH] tracing: Fix NULL pointer dereference in start_creating Kamal Agrawal
2021-07-30 22:41 ` Steven Rostedt
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