When application provided buffer size less than sockaddr_storage, then
kernel will overwrite some memory area which may cause memory corruption,
e.g.: in recvmsg case, let msg_name=malloc(8) and msg_namelen=8, then
usually application can call recvmsg successful but actually application
memory get corrupted.
Fix to return EINVAL when application buffer size less than
sockaddr_storage.
Signed-off-by: lebon.zhou <lebon.z...@gmail.com>
---
net/socket.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/socket.c b/net/socket.c
index 976426d03f09..dc32b1b899df 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -229,7 +229,7 @@ static int move_addr_to_user(struct
sockaddr_storage *kaddr, int klen,
return err;
if (len > klen)
len = klen;
- if (len < 0)
+ if (len < 0 || len < klen)
return -EINVAL;
if (len) {
if (audit_sockaddr(klen, kaddr))
--
2.22.0
