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linux/net/caif
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Ziyang Xuan 991e634360 net: fix uninit-value in caif_seqpkt_sendmsg 
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: bece7b2398 ("caif: Rewritten socket implementation")
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2021-07-15 11:08:33 -07:00
..
caif_dev.c net: caif: fix memory leak in caif_device_notify 2021-06-03 15:05:07 -07:00
caif_socket.c net: fix uninit-value in caif_seqpkt_sendmsg 2021-07-15 11:08:33 -07:00
caif_usb.c net: caif: fix memory leak in cfusbl_device_notify 2021-06-03 15:05:07 -07:00
cfcnfg.c net: caif: modify the label out_err to out 2021-06-18 12:07:09 -07:00
cfctrl.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194 2019-05-30 11:29:22 -07:00
cfdbgl.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194 2019-05-30 11:29:22 -07:00
cfdgml.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194 2019-05-30 11:29:22 -07:00
cffrml.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194 2019-05-30 11:29:22 -07:00
cfmuxl.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194 2019-05-30 11:29:22 -07:00
cfpkt_skbuff.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194 2019-05-30 11:29:22 -07:00
cfrfml.c net: caif: fix error code handling 2020-08-25 07:50:25 -07:00
cfserl.c net: caif: added cfserl_release function 2021-06-03 15:05:06 -07:00
cfsrvl.c caif: Remove duplicate macro SRVL_CTRL_PKT_SIZE 2020-09-05 15:57:05 -07:00
cfutill.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194 2019-05-30 11:29:22 -07:00
cfveil.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194 2019-05-30 11:29:22 -07:00
cfvidl.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194 2019-05-30 11:29:22 -07:00
chnl_net.c net: caif: Drop unnecessary NULL check after container_of 2021-05-13 15:55:50 -07:00
Kconfig treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00