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| author | Cong Wang <xiyou.wangcong@gmail.com> | 2018-12-29 13:56:36 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-01-09 17:14:43 +0100 |
| commit | 26a5adc8eb26d170058645c3cccd4d19165bec16 (patch) | |
| tree | 655ad893e92d5f06307bac375e35a732079912fb /net/ax25/ax25_ds_timer.c | |
| parent | 18e260fd2a4c7433e2daa861678f2dd58501904b (diff) | |
ax25: fix a use-after-free in ax25_fillin_cb()
[ Upstream commit c433570458e49bccea5c551df628d058b3526289 ]
There are multiple issues here:
1. After freeing dev->ax25_ptr, we need to set it to NULL otherwise
we may use a dangling pointer.
2. There is a race between ax25_setsockopt() and device notifier as
reported by syzbot. Close it by holding RTNL lock.
3. We need to test if dev->ax25_ptr is NULL before using it.
Reported-and-tested-by: syzbot+ae6bb869cbed29b29040@syzkaller.appspotmail.com
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/ax25/ax25_ds_timer.c')
0 files changed, 0 insertions, 0 deletions