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perf/core: Don't leak AUX buffer refcount on allocation failure

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commit 5468c0fbccbb9d156522c50832244a8b722374fb upstream.

Failure of the AUX buffer allocation leaks the reference count.

Set the reference count to 1 only when the allocation succeeds.

Fixes: 45bfb2e504 ("perf/core: Add AUX area to ring buffer for raw data streams")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Gleixner 2025-08-02 12:39:39 +02:00 • committed by Greg Kroah-Hartman
commit db3984ebe1
1 changed files with 4 additions and 3 deletions
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7
kernel/events/core.c
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@ -5877,9 +5877,7 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma)
goto unlock;
}
atomic_set(&rb->aux_mmap_count, 1);
user_extra = nr_pages;
goto accounting;
}
@ -5986,8 +5984,10 @@ accounting:
} else {
ret = rb_alloc_aux(rb, event, vma->vm_pgoff, nr_pages,
event->attr.aux_watermark, flags);
if (!ret)
if (!ret) {
atomic_set(&rb->aux_mmap_count, 1);
rb->aux_mmap_locked = extra;
}
}
unlock:
@ -5997,6 +5997,7 @@ unlock:
atomic_inc(&event->mmap_count);
} else if (rb) {
/* AUX allocation failed */
atomic_dec(&rb->mmap_count);
}
aux_unlock: