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| author | John Blackwood <john.blackwood@ccur.com> | 2010-09-28 18:03:11 -0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-10-12 11:45:01 +0200 |
| commit | ad0cf3478de8677f720ee06393b3147819568d6a (patch) | |
| tree | cd007170b0f20f724924ff53897bf534847e14c4 /kernel/perf_event.c | |
| parent | 29979aa8bd69becd94cbad59093807a417ce2a9e (diff) | |
| download | kernel-common-ad0cf3478de8677f720ee06393b3147819568d6a.tar.gz kernel-common-ad0cf3478de8677f720ee06393b3147819568d6a.tar.bz2 kernel-common-ad0cf3478de8677f720ee06393b3147819568d6a.zip | |
perf: Fix incorrect copy_from_user() usage
perf events: repair incorrect use of copy_from_user
This makes the perf_event_period() return 0 instead of
-EFAULT on success.
Signed-off-by: John Blackwood<john.blackwood@ccur.com>
Signed-off-by: Joe Korty <joe.korty@ccur.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20100928220311.GA18145@tsunami.ccur.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/perf_event.c')
| -rw-r--r-- | kernel/perf_event.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/kernel/perf_event.c b/kernel/perf_event.c index db5b56064687..b98bed3d8182 100644 --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -2202,15 +2202,13 @@ static void perf_event_for_each(struct perf_event *event, static int perf_event_period(struct perf_event *event, u64 __user *arg) { struct perf_event_context *ctx = event->ctx; - unsigned long size; int ret = 0; u64 value; if (!event->attr.sample_period) return -EINVAL; - size = copy_from_user(&value, arg, sizeof(value)); - if (size != sizeof(value)) + if (copy_from_user(&value, arg, sizeof(value))) return -EFAULT; if (!value) |