aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorZiyang Xuan <william.xuanziyang@huawei.com>2021-07-15 20:22:04 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-07-28 11:13:48 +0200
commit452c3ed7bf63721b07bc2238ed1261bb26027e85 (patch)
treee20b6b28f3f5a5387d1881b91bae3d1ecd53ce42
parent10b5522407b93fd31d73c8ae8779dc8009744f31 (diff)
downloadlinux-yocto-452c3ed7bf63721b07bc2238ed1261bb26027e85.tar.gz
linux-yocto-452c3ed7bf63721b07bc2238ed1261bb26027e85.tar.bz2
linux-yocto-452c3ed7bf63721b07bc2238ed1261bb26027e85.zip
net: fix uninit-value in caif_seqpkt_sendmsg
[ Upstream commit 991e634360f2622a683b48dfe44fe6d9cb765a09 ] When nr_segs equal to zero in iovec_from_user, the object msg->msg_iter.iov is uninit stack memory in caif_seqpkt_sendmsg which is defined in ___sys_sendmsg. So we cann't just judge msg->msg_iter.iov->base directlly. We can use nr_segs to judge msg in caif_seqpkt_sendmsg whether has data buffers. ===================================================== BUG: KMSAN: uninit-value in caif_seqpkt_sendmsg+0x693/0xf60 net/caif/caif_socket.c:542 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x220 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 caif_seqpkt_sendmsg+0x693/0xf60 net/caif/caif_socket.c:542 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2343 ___sys_sendmsg net/socket.c:2397 [inline] __sys_sendmmsg+0x808/0xc90 net/socket.c:2480 __compat_sys_sendmmsg net/compat.c:656 [inline] Reported-by: syzbot+09a5d591c1f98cf5efcb@syzkaller.appspotmail.com Link: https://syzkaller.appspot.com/bug?id=1ace85e8fc9b0d5a45c08c2656c3e91762daa9b8 Fixes: bece7b2398d0 ("caif: Rewritten socket implementation") Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>
-rw-r--r--net/caif/caif_socket.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/caif/caif_socket.c b/net/caif/caif_socket.c
index 4b31f0aaa96d..348b8cb0bc24 100644
--- a/net/caif/caif_socket.c
+++ b/net/caif/caif_socket.c
@@ -539,7 +539,8 @@ static int caif_seqpkt_sendmsg(struct socket *sock, struct msghdr *msg,
goto err;
ret = -EINVAL;
- if (unlikely(msg->msg_iter.iov->iov_base == NULL))
+ if (unlikely(msg->msg_iter.nr_segs == 0) ||
+ unlikely(msg->msg_iter.iov->iov_base == NULL))
goto err;
noblock = msg->msg_flags & MSG_DONTWAIT;