tomoyo: Check address length before reading address family

KMSAN will complain if valid address length passed to bind()/connect()/
sendmsg() is shorter than sizeof("struct sockaddr"->sa_family) bytes.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jamorris@linux.microsoft.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/security/tomoyo/network.c b/security/tomoyo/network.c
index 9094f4b3b367..f9ff121d7e1e 100644
--- a/security/tomoyo/network.c
+++ b/security/tomoyo/network.c
@@ -505,6 +505,8 @@ static int tomoyo_check_inet_address(const struct sockaddr *addr,
 {
         struct tomoyo_inet_addr_info *i = &address->inet;
 
+        if (addr_len < offsetofend(struct sockaddr, sa_family))
+                return 0;
         switch (addr->sa_family) {
         case AF_INET6:
                 if (addr_len < SIN6_LEN_RFC2133)
@@ -594,6 +596,8 @@ static int tomoyo_check_unix_address(struct sockaddr *addr,
 {
         struct tomoyo_unix_addr_info *u = &address->unix0;
 
+        if (addr_len < offsetofend(struct sockaddr, sa_family))
+                return 0;
         if (addr->sa_family != AF_UNIX)
                 return 0;
         u->addr = ((struct sockaddr_un *) addr)->sun_path;