linux-kernel - [PATCH] scsi: libfc: Prevent integer overflow in fc_fcp_recv

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Message-ID: <aNvPMet7TPtM9CY1@stanley.mountain>
Date: Tue, 30 Sep 2025 15:38:09 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Robert Love <robert.w.love@...el.com>
Cc: Hannes Reinecke <hare@...e.de>,
	"James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH] scsi: libfc: Prevent integer overflow in fc_fcp_recv_data()

The "offset" comes from the skb->data that we received.  Here the code is
verifying that "offset + len" is within bounds however it does not take
integer overflows into account.  Use size_add() to be safe.

This would only be an issue on 32bit systems which are probably a very
small percent of the users.  Still, it's worth fixing just for
correctness sake.

Fixes: 42e9a92fe6a9 ("[SCSI] libfc: A modular Fibre Channel library")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/scsi/libfc/fc_fcp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/libfc/fc_fcp.c b/drivers/scsi/libfc/fc_fcp.c
index 16d0f02af1e4..31d08c115521 100644
--- a/drivers/scsi/libfc/fc_fcp.c
+++ b/drivers/scsi/libfc/fc_fcp.c
@@ -503,7 +503,7 @@ static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
 		host_bcode = FC_ERROR;
 		goto err;
 	}
-	if (offset + len > fsp->data_len) {
+	if (size_add(offset, len) > fsp->data_len) {
 		/* this should never happen */
 		if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&
 		    fc_frame_crc_check(fp))
-- 
2.51.0