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

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Failure of the AUX buffer allocation leaks the reference count.

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

Fixes: 45bfb2e504 ("perf: 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
This commit is contained in:
Thomas Gleixner 2025-08-02 12:39:39 +02:00
parent 54473e0ef8
commit 5468c0fbcc
1 changed files with 4 additions and 3 deletions
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7
kernel/events/core.c
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@ -7051,8 +7051,6 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma)
ret = 0;
goto unlock;
}
atomic_set(&rb->aux_mmap_count, 1);
}
user_lock_limit = sysctl_perf_event_mlock >> (PAGE_SHIFT - 10);
@ -7119,9 +7117,11 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma)
} 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:
if (!ret) {
@ -7130,6 +7130,7 @@ unlock:
atomic_inc(&event->mmap_count);
} else if (rb) {
/* AUX allocation failed */
atomic_dec(&rb->mmap_count);
}
aux_unlock: