[added to the 4.1 stable tree] RDS: Heap OOB write in rds_message_alloc_sgs()

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From: Mohamed Ghannam <simo.ghannam@xxxxxxxxx>

This patch has been added to the 4.1 stable tree. If you have any
objections, please let us know.

===============

[ 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.

Signed-off-by: Mohamed Ghannam <simo.ghannam@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
---
 net/rds/rdma.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/rds/rdma.c b/net/rds/rdma.c
index 612c3050d514..3e6b133c5e96 100644
--- a/net/rds/rdma.c
+++ b/net/rds/rdma.c
@@ -516,6 +516,9 @@ int rds_rdma_extra_size(struct rds_rdma_args *args)
 
 	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],
-- 
2.14.1




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