Commit 4579a1ba authored by Anton Ivanov's avatar Anton Ivanov Committed by Richard Weinberger

um: Fix initialization of vector queues

UML vector drivers could derefence uninitialized memory
when cleaning up after a queue allocation failure.

Fixes: 49da7e64 ("High Performance UML Vector Network Driver")
Cc: <stable@vger.kernel.org>
Reported-by: default avatarDan Capenter <dan.carpenter@oracle.com>
Signed-off-by: default avatarAnton Ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
parent cca76c1a
......@@ -504,15 +504,19 @@ static struct vector_queue *create_queue(
result = kmalloc(sizeof(struct vector_queue), GFP_KERNEL);
if (result == NULL)
goto out_fail;
return NULL;
result->max_depth = max_size;
result->dev = vp->dev;
result->mmsg_vector = kmalloc(
(sizeof(struct mmsghdr) * max_size), GFP_KERNEL);
if (result->mmsg_vector == NULL)
goto out_mmsg_fail;
result->skbuff_vector = kmalloc(
(sizeof(void *) * max_size), GFP_KERNEL);
if (result->mmsg_vector == NULL || result->skbuff_vector == NULL)
goto out_fail;
if (result->skbuff_vector == NULL)
goto out_skb_fail;
/* further failures can be handled safely by destroy_queue*/
mmsg_vector = result->mmsg_vector;
for (i = 0; i < max_size; i++) {
......@@ -563,6 +567,11 @@ static struct vector_queue *create_queue(
result->head = 0;
result->tail = 0;
return result;
out_skb_fail:
kfree(result->mmsg_vector);
out_mmsg_fail:
kfree(result);
return NULL;
out_fail:
destroy_queue(result);
return NULL;
......
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