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| author | Peter Zijlstra <peterz@infradead.org> | 2014-10-02 16:17:02 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-10-02 16:28:44 -0700 |
| commit | 6c72e3501d0d62fc064d3680e5234f3463ec5a86 (patch) | |
| tree | 48b15a8bc67816fe492e1323580bf8ee99b29e81 /kernel/events | |
| parent | cba5b1c6e2c42152135a85b90bf820b77d6527da (diff) | |
| download | linux-6c72e3501d0d62fc064d3680e5234f3463ec5a86.tar.gz | |
perf: fix perf bug in fork()
Oleg noticed that a cleanup by Sylvain actually uncovered a bug; by calling perf_event_free_task() when failing sched_fork() we will not yet have done the memset() on ->perf_event_ctxp[] and will therefore try and 'free' the inherited contexts, which are still in use by the parent process. This is bad.. Suggested-by: Oleg Nesterov <oleg@redhat.com> Reported-by: Oleg Nesterov <oleg@redhat.com> Reported-by: Sylvain 'ythier' Hitier <sylvain.hitier@gmail.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/events')
| -rw-r--r-- | kernel/events/core.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index d640a8b4dcbc..963bf139e2b2 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -7948,8 +7948,10 @@ int perf_event_init_task(struct task_struct *child) for_each_task_context_nr(ctxn) { ret = perf_event_init_context(child, ctxn); - if (ret) + if (ret) { + perf_event_free_task(child); return ret; + } } return 0; |