RDMA/rtrs-clt: Check strnlen return len in sysfs mpath_policy_store()

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: dc3b66a ("RDMA/rtrs-clt: Add a minimum latency multipath policy")
Signed-off-by: Alexey Kodanev <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Acked-by: Jack Wang <[email protected]>
Signed-off-by: Leon Romanovsky <[email protected]>

Author: akodanev

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) ||