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| author | Mateusz Jurczyk <mjurczyk@google.com> | 2017-06-29 14:04:59 +0200 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2017-06-29 14:37:57 +0200 |
| commit | d2ecfa765dff59145a4ba9c84856e50c4f43c2b2 (patch) | |
| tree | 234b4b6a034d7398be70b2ca7dd655de5aad864d /net/bluetooth/rfcomm | |
| parent | 29e2dd0d56ea0d6c4a95c080760e1cc748fb6f14 (diff) | |
| download | linux-d2ecfa765dff59145a4ba9c84856e50c4f43c2b2.tar.gz linux-d2ecfa765dff59145a4ba9c84856e50c4f43c2b2.tar.bz2 linux-d2ecfa765dff59145a4ba9c84856e50c4f43c2b2.zip | |
Bluetooth: Add sockaddr length checks before accessing sa_family in bind and connect handlers
Verify that the caller-provided sockaddr structure is large enough to
contain the sa_family field, before accessing it in bind() and connect()
handlers of the Bluetooth sockets. Since neither syscall enforces a minimum
size of the corresponding memory region, very short sockaddrs (zero or one
byte long) result in operating on uninitialized memory while referencing
sa_family.
Signed-off-by: Mateusz Jurczyk <mjurczyk@google.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/bluetooth/rfcomm')
| -rw-r--r-- | net/bluetooth/rfcomm/sock.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c index ac3c650cb234..2025b45a8bf8 100644 --- a/net/bluetooth/rfcomm/sock.c +++ b/net/bluetooth/rfcomm/sock.c @@ -339,7 +339,8 @@ static int rfcomm_sock_bind(struct socket *sock, struct sockaddr *addr, int addr struct sock *sk = sock->sk; int len, err = 0; - if (!addr || addr->sa_family != AF_BLUETOOTH) + if (!addr || addr_len < offsetofend(struct sockaddr, sa_family) || + addr->sa_family != AF_BLUETOOTH) return -EINVAL; memset(&sa, 0, sizeof(sa)); |