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| author |   Alexey Kodanev <alexey.kodanev@oracle.com> | 2018-03-06 22:57:01 +0300 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-03-07 13:38:56 -0500 |
| commit | 67f93df79aeefc3add4e4b31a752600f834236e2 (patch) | |
| tree | 97dea36b4920e18f83a9918b812a35b65b7100e0 /net/ipv4/tcp_timer.c | |
| parent | l2tp: do not accept arbitrary sockets (diff) | |
| download | linux-dev-67f93df79aeefc3add4e4b31a752600f834236e2.tar.xz linux-dev-67f93df79aeefc3add4e4b31a752600f834236e2.zip | |
dccp: check sk for closed state in dccp_sendmsg()
dccp_disconnect() sets 'dp->dccps_hc_tx_ccid' tx handler to NULL,
therefore if DCCP socket is disconnected and dccp_sendmsg() is
called after it, it will cause a NULL pointer dereference in
dccp_write_xmit().
This crash and the reproducer was reported by syzbot. Looks like
it is reproduced if commit 69c64866ce07 ("dccp: CVE-2017-8824:
use-after-free in DCCP code") is applied.
Reported-by: syzbot+f99ab3887ab65d70f816@syzkaller.appspotmail.com
Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_timer.c')
0 files changed, 0 insertions, 0 deletions