linux-kernel - [PATCH] RDMA/siw: Fix potential page

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Date:   Mon, 27 Feb 2023 01:17:51 -0800
From:   Daniil Dulov <d.dulov@...ddin.ru>
To:     Bernard Metzler <bmt@...ich.ibm.com>
CC:     Daniil Dulov <d.dulov@...ddin.ru>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>, <linux-rdma@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <lvc-project@...uxtesting.org>
Subject: [PATCH] RDMA/siw: Fix potential page_array out of range access

When seg is equal to MAX_ARRAY, the loop should break, otherwise
it will result in out of range access.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: b9be6f18cf9e ("rdma/siw: transmit path")
Signed-off-by: Daniil Dulov <d.dulov@...ddin.ru>
---
 drivers/infiniband/sw/siw/siw_qp_tx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/sw/siw/siw_qp_tx.c b/drivers/infiniband/sw/siw/siw_qp_tx.c
index 3c3ae5ef2942..f9eb314c6e14 100644
--- a/drivers/infiniband/sw/siw/siw_qp_tx.c
+++ b/drivers/infiniband/sw/siw/siw_qp_tx.c
@@ -548,7 +548,7 @@ static int siw_tx_hdt(struct siw_iwarp_tx *c_tx, struct socket *s)
 			data_len -= plen;
 			fp_off = 0;
 
-			if (++seg > (int)MAX_ARRAY) {
+			if (++seg == (int)MAX_ARRAY) {
 				siw_dbg_qp(tx_qp(c_tx), "to many fragments\n");
 				siw_unmap_pages(page_array, kmap_mask);
 				wqe->processed -= c_tx->bytes_unsent;
-- 
2.25.1