From f2f6e1661d38fbce6163fc321395e9de24a9529b Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Sat, 18 Feb 2023 10:57:05 -0800 Subject: [PATCH] IB/rdmavt: Fix target union member for rvt_post_one_wr() The "cplen" result used by the memcpy() into struct rvt_swqe "wqe" may be sized to 80 for struct rvt_ud_wr (which is member "ud_wr", not "wr" which is only 40 bytes in size). Change the destination union member so the compiler can use the correct bounds check. struct rvt_swqe { union { struct ib_send_wr wr; /* don't use wr.sg_list */ struct rvt_ud_wr ud_wr; ... }; ... }; Silences false positive memcpy() run-time warning: memcpy: detected field-spanning write (size 80) of single field "&wqe->wr" at drivers/infiniband/sw/rdmavt/qp.c:2043 (size 40) Reported-by: Zhang Yi Link: https://bugzilla.kernel.org/show_bug.cgi?id=216561 Cc: Dennis Dalessandro Cc: Jason Gunthorpe Cc: Leon Romanovsky Cc: linux-rdma@vger.kernel.org Signed-off-by: Kees Cook Link: https://lore.kernel.org/r/20230218185701.never.779-kees@kernel.org Reviewed-by: Dennis Dalessandro Signed-off-by: Leon Romanovsky --- drivers/infiniband/sw/rdmavt/qp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/infiniband/sw/rdmavt/qp.c b/drivers/infiniband/sw/rdmavt/qp.c index 3acab56..3f707e1 100644 --- a/drivers/infiniband/sw/rdmavt/qp.c +++ b/drivers/infiniband/sw/rdmavt/qp.c @@ -2040,7 +2040,7 @@ static int rvt_post_one_wr(struct rvt_qp *qp, wqe = rvt_get_swqe_ptr(qp, qp->s_head); /* cplen has length from above */ - memcpy(&wqe->wr, wr, cplen); + memcpy(&wqe->ud_wr, wr, cplen); wqe->length = 0; j = 0; -- 2.7.4