linux-kernel - [PATCH net 1/2] liquidio: Fix an off by one in octeon_download

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Date:   Sun, 22 Oct 2023 22:59:46 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     dchickles@...vell.com, sburla@...vell.com, fmanlunas@...vell.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, veerasenareddy.burru@...ium.com
Cc:     felix.manlunas@...ium.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH net 1/2] liquidio: Fix an off by one in octeon_download_firmware()

In order to append the 'boottime' string to 'h->bootcmd', the final NULL
has to betaken into account when checking if there is enough space.

Fixes: 907aaa6babe1 ("liquidio: pass date and time info to NIC firmware")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/net/ethernet/cavium/liquidio/octeon_console.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/cavium/liquidio/octeon_console.c b/drivers/net/ethernet/cavium/liquidio/octeon_console.c
index 67c3570f875f..bd6baf2872a5 100644
--- a/drivers/net/ethernet/cavium/liquidio/octeon_console.c
+++ b/drivers/net/ethernet/cavium/liquidio/octeon_console.c
@@ -899,13 +899,13 @@ int octeon_download_firmware(struct octeon_device *oct, const u8 *data,
 	ret = snprintf(boottime, MAX_BOOTTIME_SIZE,
 		       " time_sec=%lld time_nsec=%ld",
 		       (s64)ts.tv_sec, ts.tv_nsec);
-	if ((sizeof(h->bootcmd) - strnlen(h->bootcmd, sizeof(h->bootcmd))) <
+	if ((sizeof(h->bootcmd) - strnlen(h->bootcmd, sizeof(h->bootcmd))) <=
 		ret) {
 		dev_err(&oct->pci_dev->dev, "Boot command buffer too small\n");
 		return -EINVAL;
 	}
 	strncat(h->bootcmd, boottime,
-		sizeof(h->bootcmd) - strnlen(h->bootcmd, sizeof(h->bootcmd)));
+		sizeof(h->bootcmd) - strnlen(h->bootcmd, sizeof(h->bootcmd)) - 1);
 
 	dev_info(&oct->pci_dev->dev, "Writing boot command: %s\n",
 		 h->bootcmd);
-- 
2.34.1