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Commit b7dd5edc authored by Eyal Itkin's avatar Eyal Itkin Committed by Greg Kroah-Hartman
Browse files

IB/rxe: Fix mem_check_range integer overflow 



commit 647bf3d8a8e5777319da92af672289b2a6c4dc66 upstream.

Update the range check to avoid integer-overflow in edge case.
Resolves CVE 2016-8636.

Signed-off-by: default avatarEyal Itkin <eyal.itkin@gmail.com>
Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: default avatarLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 5476efee

drivers/infiniband/sw/rxe/rxe_mr.c

+5 −3
Original line number Diff line number Diff line
@@ -59,9 +59,11 @@ int mem_check_range(struct rxe_mem *mem, u64 iova, size_t length) 


	case RXE_MEM_TYPE_MR:

	case RXE_MEM_TYPE_FMR:

		return ((iova < mem->iova) ||

			((iova + length) > (mem->iova + mem->length))) ?

			-EFAULT : 0;

		if (iova < mem->iova ||

		    length > mem->length ||

		    iova > mem->iova + mem->length - length)

			return -EFAULT;

		return 0;



	default:

		return -EFAULT;