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perf_events: Fix invalid pointer when pid is invalid 

This patch fixes an error in perf_event_open() when the pid
provided by the user is invalid. find_lively_task_by_vpid()
does not return NULL on error but an error code. Without the
fix the error code was silently passed to find_get_context()
which would eventually cause a invalid pointer dereference.

Signed-off-by: Stephane Eranian <eranian@google.com>
Cc: peterz@infradead.org
Cc: paulus@samba.org
Cc: davem@davemloft.net
Cc: fweisbec@gmail.com
Cc: perfmon2-devel@lists.sf.net
Cc: eranian@gmail.com
Cc: robert.richter@amd.com
LKML-Reference: <4ca9a5d1.e8e9d80a.3dbb.ffff8f2e@mx.google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Stephane Eranian 2010-10-04 12:00:02 +02:00 committed by Ingo Molnar
parent d6dad199a1
commit 540804b5c5
1 changed files with 6 additions and 1 deletions
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7
kernel/perf_event.c
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@ -5616,8 +5616,13 @@ SYSCALL_DEFINE5(perf_event_open,
}
}
if (pid != -1)
if (pid != -1) {
task = find_lively_task_by_vpid(pid);
if (IS_ERR(task)) {
err = PTR_ERR(task);
goto err_group_fd;
}
}
/*
* Get the target context (task or percpu):