| From | Sasha Levin <> | Subject | [PATCH AUTOSEL for 4.4 033/162] caif: Add sockaddr length check before accessing sa_family in connect handler | Date | Mon, 9 Apr 2018 00:28:06 +0000 |
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From: Mateusz Jurczyk <mjurczyk@google.com>
[ Upstream commit 20a3d5bf5e5b13c02450ab6178ec374abd830686 ]
Verify that the caller-provided sockaddr structure is large enough to contain the sa_family field, before accessing it in the connect() handler of the AF_CAIF socket. Since the syscall doesn't enforce 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: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> --- net/caif/caif_socket.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/net/caif/caif_socket.c b/net/caif/caif_socket.c index aa209b1066c9..bbc80e4e08f5 100644 --- a/net/caif/caif_socket.c +++ b/net/caif/caif_socket.c @@ -754,6 +754,10 @@ static int caif_connect(struct socket *sock, struct sockaddr *uaddr, lock_sock(sk); + err = -EINVAL; + if (addr_len < offsetofend(struct sockaddr, sa_family)) + goto out; + err = -EAFNOSUPPORT; if (uaddr->sa_family != AF_CAIF) goto out; -- 2.15.1
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