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| author | Michael S. Tsirkin <mst@redhat.com> | 2010-07-26 16:55:30 +0930 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-07-26 08:05:31 -0700 |
| commit | 1fe9b6fef11771461e69ecd1bc8935a1c7c90cb5 (patch) | |
| tree | 3ecc82deed99dc11c67d64bfea2737fc68d769d3 | |
| parent | 2e65a2075cc740b485ab203430bdf3459d5551b6 (diff) | |
| download | linux-stable-1fe9b6fef11771461e69ecd1bc8935a1c7c90cb5.tar.gz linux-stable-1fe9b6fef11771461e69ecd1bc8935a1c7c90cb5.tar.bz2 linux-stable-1fe9b6fef11771461e69ecd1bc8935a1c7c90cb5.zip | |
virtio: fix oops on OOM
virtio ring was changed to return an error code on OOM,
but one caller was missed and still checks for vq->vring.num.
The fix is just to check for <0 error code.
Long term it might make sense to change goto add_head to
just return an error on oom instead, but let's apply
a minimal fix for 2.6.35.
Reported-by: Chris Mason <chris.mason@oracle.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Tested-by: Chris Mason <chris.mason@oracle.com>
Cc: stable@kernel.org # .34.x
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/virtio/virtio_ring.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index afe7e21dd0ae..1475ed6b575f 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -164,7 +164,8 @@ int virtqueue_add_buf_gfp(struct virtqueue *_vq, gfp_t gfp) { struct vring_virtqueue *vq = to_vvq(_vq); - unsigned int i, avail, head, uninitialized_var(prev); + unsigned int i, avail, uninitialized_var(prev); + int head; START_USE(vq); @@ -174,7 +175,7 @@ int virtqueue_add_buf_gfp(struct virtqueue *_vq, * buffers, then go indirect. FIXME: tune this threshold */ if (vq->indirect && (out + in) > 1 && vq->num_free) { head = vring_add_indirect(vq, sg, out, in, gfp); - if (head != vq->vring.num) + if (likely(head >= 0)) goto add_head; } |