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[5.13,580/800] Bluetooth: virtio_bt: add missing null pointer check on alloc_skb call return

Message ID 20210712061029.038538404@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH July 12, 2021, 6:10 a.m. UTC 
From: Colin Ian King <colin.king@canonical.com>

[ Upstream commit 1cb027f2f803d0a7abe9c291f0625e6bccd25999 ]

The call to alloc_skb with the GFP_KERNEL flag can return a null sk_buff
pointer, so add a null check to avoid any null pointer deference issues.

Addresses-Coverity: ("Dereference null return value")
Fixes: afd2daa26c7a ("Bluetooth: Add support for virtio transport driver")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/bluetooth/virtio_bt.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/drivers/bluetooth/virtio_bt.c b/drivers/bluetooth/virtio_bt.c
index c804db7e90f8..57908ce4fae8 100644
--- a/drivers/bluetooth/virtio_bt.c
+++ b/drivers/bluetooth/virtio_bt.c
@@ -34,6 +34,9 @@  static int virtbt_add_inbuf(struct virtio_bluetooth *vbt)
 	int err;
 
 	skb = alloc_skb(1000, GFP_KERNEL);
+	if (!skb)
+		return -ENOMEM;
+
 	sg_init_one(sg, skb->data, 1000);
 
 	err = virtqueue_add_inbuf(vq, sg, 1, skb, GFP_KERNEL);