4.9-stable review patch. If anyone has any objections, please let me know.
------------------ From: Eyal Itkin <[email protected]> commit 647bf3d8a8e5777319da92af672289b2a6c4dc66 upstream. Update the range check to avoid integer-overflow in edge case. Resolves CVE 2016-8636. Signed-off-by: Eyal Itkin <[email protected]> Signed-off-by: Dan Carpenter <[email protected]> Reviewed-by: Leon Romanovsky <[email protected]> Signed-off-by: Doug Ledford <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/infiniband/sw/rxe/rxe_mr.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) --- a/drivers/infiniband/sw/rxe/rxe_mr.c +++ b/drivers/infiniband/sw/rxe/rxe_mr.c @@ -59,9 +59,11 @@ int mem_check_range(struct rxe_mem *mem, 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;
