From: Jiasheng Jiang <jiasheng@iscas.ac.cn>
To: mst@redhat.com, jasowang@redhat.com
Cc: virtualization@lists.linux-foundation.org,
linux-kernel@vger.kernel.org,
Jiasheng Jiang <jiasheng@iscas.ac.cn>
Subject: [PATCH] virtio_ring: Check null pointer
Date: Fri, 24 Dec 2021 18:10:07 +0800 [thread overview]
Message-ID: <20211224101007.1635703-1-jiasheng@iscas.ac.cn> (raw)
As the alloc_indirect_packed() returns kmalloc_array() that could
allocation fail and return null pointer, it should be check in order to
prevent the dereference of null pointer.
Fixes: 1ce9e6055fa0 ("virtio_ring: introduce packed ring support")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
---
drivers/virtio/virtio_ring.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 71e16b53e9c1..30fd925165ac 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -991,7 +991,12 @@ static int virtqueue_add_indirect_packed(struct vring_virtqueue *vq,
dma_addr_t addr;
head = vq->packed.next_avail_idx;
+
desc = alloc_indirect_packed(total_sg, gfp);
+ if (!desc) {
+ END_USE(vq);
+ return -ENOMEM;
+ }
if (unlikely(vq->vq.num_free < 1)) {
pr_debug("Can't add buf len 1 - avail = 0\n");
--
2.25.1
next reply other threads:[~2021-12-24 10:10 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-24 10:10 Jiasheng Jiang [this message]
2022-01-04 3:42 ` [PATCH] virtio_ring: Check null pointer Jason Wang
2022-01-04 3:42 ` Jason Wang
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