Patch "RDS: Heap OOB write in rds_message_alloc_sgs()" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

RDS: Heap OOB write in rds_message_alloc_sgs()

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
rds-heap-oob-write-in-rds_message_alloc_sgs.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Mohamed Ghannam <[email protected]>
Date: Tue, 2 Jan 2018 19:44:34 +0000
Subject: RDS: Heap OOB write in rds_message_alloc_sgs()

From: Mohamed Ghannam <[email protected]>

[ Upstream commit c095508770aebf1b9218e77026e48345d719b17c ]

When args->nr_local is 0, nr_pages gets also 0 due some size calculation via rds_rm_size(), which is later used to allocate pages for DMA, this bug produces a heap Out-Of-Bound write access to a specific memory region.

---
 net/rds/rdma.c |    3 +++
 1 file changed, 3 insertions(+)

@@ -524,6 +524,9 @@ int rds_rdma_extra_size(struct rds_rdma_
 
 	local_vec = (struct rds_iovec __user *)(unsigned long) args->local_vec_addr;
 
+	if (args->nr_local == 0)
+		return -EINVAL;
+
 	/* figure out the number of pages in the vector */
 	for (i = 0; i < args->nr_local; i++) {
 		if (copy_from_user(&vec, &local_vec[i],

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/rds-null-pointer-dereference-in-rds_atomic_free_op.patch queue-4.9/rds-heap-oob-write-in-rds_message_alloc_sgs.patch