From e95eeb7f7d8c07ea238805ac21450e780653cc8a Mon Sep 17 00:00:00 2001 From: Christophe JAILLET Date: Tue, 24 Oct 2023 23:58:20 +0200 Subject: [PATCH] net: sunrpc: Fix an off by one in rpc_sockaddr2uaddr() [ 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 Reviewed-by: Benjamin Coddington Signed-off-by: Trond Myklebust Signed-off-by: Sasha Levin --- 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 0d4a2bb09589..be2fc88f5bde 100644 --- a/net/sunrpc/addr.c +++ b/net/sunrpc/addr.c @@ -288,10 +288,10 @@ 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);