[PATCH 4.19 131/148] net: sunrpc: Fix an off by one in rpc_sockaddr2uaddr()

Sasha Levin
2024-03-24T23:52:44Z

From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>

[ Upstream commit d6f4de70f73a106986ee315d7d512539f2f3303a ]

The intent is to check if the strings' are truncated or not. So, >= should
be used instead of >, because strlcat() and snprintf() return the length of
the output, excluding the trailing NULL.

Fixes: a02d69261134 ("SUNRPC: Provide functions for managing universal addresses")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/sunrpc/addr.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/sunrpc/addr.c b/net/sunrpc/addr.c
index 7404f02702a1c..eba3b6f4d4ace 100644
--- a/net/sunrpc/addr.c
+++ b/net/sunrpc/addr.c
@@ -287,10 +287,10 @@ char *rpc_sockaddr2uaddr(const struct sockaddr *sap, gfp_t gfp_flags)
}

if (snprintf(portbuf, sizeof(portbuf),
- ".%u.%u", port >> 8, port & 0xff) > (int)sizeof(portbuf))
+ ".%u.%u", port >> 8, port & 0xff) >= (int)sizeof(portbuf))
return NULL;

- if (strlcat(addrbuf, portbuf, sizeof(addrbuf)) > sizeof(addrbuf))
+ if (strlcat(addrbuf, portbuf, sizeof(addrbuf)) >= sizeof(addrbuf))
return NULL;

return kstrdup(addrbuf, gfp_flags);
--
2.43.0