From 7a7b7f575a25aa68ee934ee8107294487efcb3fe Mon Sep 17 00:00:00 2001
From: Alexey Kodanev <aleksei.kodanev@bell-sw.com>
Date: Wed, 21 Feb 2024 11:32:04 +0000
Subject: [PATCH 1/1] RDMA/rtrs-clt: Check strnlen return len in sysfs
 mpath_policy_store()
Git-commit: 7a7b7f575a25aa68ee934ee8107294487efcb3fe
Patch-mainline: v6.9-rc1
References: git-fixes

strnlen() may return 0 (e.g. for "\0\n" string), it's better to
check the result of strnlen() before using 'len - 1' expression
for the 'buf' array index.

Detected using the static analysis tool - Svace.

Fixes: dc3b66a0ce70 ("RDMA/rtrs-clt: Add a minimum latency multipath policy")
Signed-off-by: Alexey Kodanev <aleksei.kodanev@bell-sw.com>
Link: https://lore.kernel.org/r/20240221113204.147478-1-aleksei.kodanev@bell-sw.com
Acked-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Acked-by: Nicolas Morey <nmorey@suse.com>
---
 drivers/infiniband/ulp/rtrs/rtrs-clt-sysfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/ulp/rtrs/rtrs-clt-sysfs.c b/drivers/infiniband/ulp/rtrs/rtrs-clt-sysfs.c
index d3c436ead694..4aa80c9388f0 100644
--- a/drivers/infiniband/ulp/rtrs/rtrs-clt-sysfs.c
+++ b/drivers/infiniband/ulp/rtrs/rtrs-clt-sysfs.c
@@ -133,7 +133,7 @@ static ssize_t mpath_policy_store(struct device *dev,
 
 	/* distinguish "mi" and "min-latency" with length */
 	len = strnlen(buf, NAME_MAX);
-	if (buf[len - 1] == '\n')
+	if (len && buf[len - 1] == '\n')
 		len--;
 
 	if (!strncasecmp(buf, "round-robin", 11) ||
-- 
2.39.1.1.gbe015eda0162