Commit c0955087 authored Jan 02, 2018 by Mohamed Ghannam Committed by David S. Miller Jan 03, 2018

RDS: Heap OOB write in rds_message_alloc_sgs()



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@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent c0bace79

net/rds/rdma.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -525,6 +525,9 @@ 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],