If optlen < sizeof(u32) it will trigger oob, so take the min of them.
Reported-by: syzbot+d4ecae01a53fd9b42e7d@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Edward Adam Davis <eadavis@xxxxxx>
---
net/bluetooth/rfcomm/sock.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index b54e8a530f55..42c55c756b51 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -629,7 +629,7 @@ static int rfcomm_sock_setsockopt_old(struct socket *sock, int optname,
switch (optname) {
case RFCOMM_LM:
- if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
+ if (copy_from_sockptr(&opt, optval, min_t(int, sizeof(u32), optlen))) {
err = -EFAULT;
break;
}
--
2.43.0
