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linux-stable/net/rose
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Anmol Karn 731b9890a7 rose: Fix Null pointer dereference in rose_send_frame() 
[ Upstream commit 3b3fd068c5 ]

rose_send_frame() dereferences `neigh->dev` when called from
rose_transmit_clear_request(), and the first occurrence of the
`neigh` is in rose_loopback_timer() as `rose_loopback_neigh`,
and it is initialized in rose_add_loopback_neigh() as NULL.
i.e when `rose_loopback_neigh` used in rose_loopback_timer()
its `->dev` was still NULL and rose_loopback_timer() was calling
rose_rx_call_request() without checking for NULL.

- net/rose/rose_link.c
This bug seems to get triggered in this line:

rose_call = (ax25_address *)neigh->dev->dev_addr;

Fix it by adding NULL checking for `rose_loopback_neigh->dev`
in rose_loopback_timer().

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Suggested-by: Jakub Kicinski <kuba@kernel.org>
Reported-by: syzbot+a1c743815982d9496393@syzkaller.appspotmail.com
Tested-by: syzbot+a1c743815982d9496393@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?id=9d2a7ca8c7f2e4b682c97578dfa3f236258300b3
Signed-off-by: Anmol Karn <anmol.karan123@gmail.com>
Link: https://lore.kernel.org/r/20201119191043.28813-1-anmol.karan123@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-12-08 10:18:52 +01:00
..
af_rose.c Revert changes to convert to ->poll_mask() and aio IOCB_CMD_POLL 2018-06-28 10:40:47 -07:00
Makefile
rose_dev.c net: Kill dev_rebuild_header 2015-03-02 16:43:41 -05:00
rose_in.c net: rose: mark expected switch fall-throughs 2017-10-22 02:02:26 +01:00
rose_link.c treewide: Remove TIMER_FUNC_TYPE and TIMER_DATA_TYPE casts 2017-11-21 16:35:54 -08:00
rose_loopback.c rose: Fix Null pointer dereference in rose_send_frame() 2020-12-08 10:18:52 +01:00
rose_out.c
rose_route.c net/rose: fix NULL ax25_cb kernel panic 2019-02-06 17:30:07 +01:00
rose_subr.c net: rose: fix a possible stack overflow 2019-04-03 06:26:17 +02:00
rose_timer.c treewide: Remove TIMER_FUNC_TYPE and TIMER_DATA_TYPE casts 2017-11-21 16:35:54 -08:00
sysctl_net_rose.c