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authorAnton Ivanov <anton.ivanov@cambridgegreys.com>2018-06-05 11:27:30 +0300
committerRichard Weinberger <richard@nod.at>2018-06-10 23:50:13 +0300
commit4579a1ba692af81da7ea6ce197f8169ddc0c327f (patch)
tree4eeafbb5943de9e6cdb3c4360363ad88ba131268 /arch/um
parentcca76c1ad61d08097af5a691195f9a42d72e978f (diff)
downloadlinux-4579a1ba692af81da7ea6ce197f8169ddc0c327f.tar.xz
um: Fix initialization of vector queues
UML vector drivers could derefence uninitialized memory when cleaning up after a queue allocation failure. Fixes: 49da7e64f33e ("High Performance UML Vector Network Driver") Cc: <stable@vger.kernel.org> Reported-by: Dan Capenter <dan.carpenter@oracle.com> Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um')
-rw-r--r--arch/um/drivers/vector_kern.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/arch/um/drivers/vector_kern.c b/arch/um/drivers/vector_kern.c
index 02168fe25105..8b852928959b 100644
--- a/arch/um/drivers/vector_kern.c
+++ b/arch/um/drivers/vector_kern.c
@@ -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;