diff options
| author | David Howells <dhowells@redhat.com> | 2022-11-11 16:00:21 +0000 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2022-11-16 08:05:11 +0000 |
| commit | 6423ac2eb31ec33f8526dc48f1e541b665333970 (patch) | |
| tree | 8279a2d062895066c8a29c7452387ba676019283 /net | |
| parent | 41cf3a9156ba8e13e557e7908f9e22563b1f2828 (diff) | |
| download | linux-6423ac2eb31ec33f8526dc48f1e541b665333970.tar.bz2 | |
rxrpc: Fix oops from calling udpv6_sendmsg() on AF_INET socket
If rxrpc sees an IPv6 address, it assumes it can call udpv6_sendmsg() on it
- even if it got it on an IPv4 socket. Fix do_udp_sendmsg() to give an
error in such a case.
general protection fault, probably for non-canonical address
0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
...
RIP: 0010:ipv6_addr_v4mapped include/net/ipv6.h:749 [inline]
RIP: 0010:udpv6_sendmsg+0xd0a/0x2c70 net/ipv6/udp.c:1361
...
Call Trace:
do_udp_sendmsg net/rxrpc/output.c:27 [inline]
do_udp_sendmsg net/rxrpc/output.c:21 [inline]
rxrpc_send_abort_packet+0x73b/0x860 net/rxrpc/output.c:367
rxrpc_release_calls_on_socket+0x211/0x300 net/rxrpc/call_object.c:595
rxrpc_release_sock net/rxrpc/af_rxrpc.c:886 [inline]
rxrpc_release+0x263/0x5a0 net/rxrpc/af_rxrpc.c:917
__sock_release+0xcd/0x280 net/socket.c:650
sock_close+0x18/0x20 net/socket.c:1365
__fput+0x27c/0xa90 fs/file_table.c:320
task_work_run+0x16b/0x270 kernel/task_work.c:179
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0xb35/0x2a20 kernel/exit.c:820
do_group_exit+0xd0/0x2a0 kernel/exit.c:950
__do_sys_exit_group kernel/exit.c:961 [inline]
__se_sys_exit_group kernel/exit.c:959 [inline]
__x64_sys_exit_group+0x3a/0x50 kernel/exit.c:959
Fixes: ed472b0c8783 ("rxrpc: Call udp_sendmsg() directly")
Reported-by: Eric Dumazet <edumazet@google.com>
Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Diffstat (limited to 'net')
| -rw-r--r-- | net/rxrpc/output.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c index 46432e70a16b..a2fe1a262f8a 100644 --- a/net/rxrpc/output.c +++ b/net/rxrpc/output.c @@ -18,15 +18,21 @@ extern int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len); -static ssize_t do_udp_sendmsg(struct socket *sk, struct msghdr *msg, size_t len) +static ssize_t do_udp_sendmsg(struct socket *socket, struct msghdr *msg, size_t len) { -#if IS_ENABLED(CONFIG_AF_RXRPC_IPV6) struct sockaddr *sa = msg->msg_name; + struct sock *sk = socket->sk; - if (sa->sa_family == AF_INET6) - return udpv6_sendmsg(sk->sk, msg, len); -#endif - return udp_sendmsg(sk->sk, msg, len); + if (IS_ENABLED(CONFIG_AF_RXRPC_IPV6)) { + if (sa->sa_family == AF_INET6) { + if (sk->sk_family != AF_INET6) { + pr_warn("AF_INET6 address on AF_INET socket\n"); + return -ENOPROTOOPT; + } + return udpv6_sendmsg(sk, msg, len); + } + } + return udp_sendmsg(sk, msg, len); } struct rxrpc_abort_buffer { |