Revision - 828b6f0 - perf: Fix NULL deref - origin: https://github.com/torvalds/linux

visit type:

https://github.com/torvalds/linux

29 July 2024, 15:18:00 UTC

Revision 828b6f0e26170938d617e99a17177453be4d77a3 authored by Peter Zijlstra on 27 January 2016, 20:59:04 UTC, committed by Ingo Molnar on 29 January 2016, 07:35:24 UTC

perf: Fix NULL deref

Dan reported:

  1229                  if (ctx->task == TASK_TOMBSTONE ||
  1230                      !atomic_inc_not_zero(&ctx->refcount)) {
  1231                          raw_spin_unlock(&ctx->lock);
  1232                          ctx = NULL;
                                ^^^^^^^^^^
ctx is NULL.

  1233                  }
  1234
  1235                  WARN_ON_ONCE(ctx->task != task);
                                     ^^^^^^^^^^^^^^^^^
The patch adds a NULL dereference.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Fixes: 63b6da39bb38 ("perf: Fix perf_event_exit_task() race")
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 parent 8f04b85

Files
Changes

Permalinks

Tip revision: 828b6f0e26170938d617e99a17177453be4d77a3 authored by Peter Zijlstra on 27 January 2016, 20:59:04 UTC
perf: Fix NULL deref

Tip revision: 828b6f0

File	Mode	Size
Documentation
arch
block
certs
crypto
drivers
firmware
fs
include
init
ipc
kernel
lib
mm
net
samples
scripts
security
sound
tools
usr
virt
.get_maintainer.ignore	-rw-r--r--	31 bytes
.gitignore	-rw-r--r--	1.2 KB
.mailmap	-rw-r--r--	5.4 KB
COPYING	-rw-r--r--	18.3 KB
CREDITS	-rw-r--r--	95.2 KB
Kbuild	-rw-r--r--	2.6 KB
Kconfig	-rw-r--r--	252 bytes
MAINTAINERS	-rw-r--r--	330.9 KB
Makefile	-rw-r--r--	53.5 KB
README	-rw-r--r--	18.2 KB
REPORTING-BUGS	-rw-r--r--	7.3 KB

Showing with 0 additions and 0 deletions (0 / 0 diffs computed)

Computing file changes ...

https://github.com/torvalds/linux

perf: Fix NULL deref

README