4.17-stable review patch. If anyone has any objections, please let me know.
------------------
From: Anton Ivanov <anton.ivanov@xxxxxxxxxxxxxxxxxx>
commit 4579a1ba692af81da7ea6ce197f8169ddc0c327f upstream.
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@xxxxxxxxxxxxxxx>
Reported-by: Dan Capenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Anton Ivanov <anton.ivanov@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Richard Weinberger <richard@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/um/drivers/vector_kern.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
--- 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;
