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| author | Takashi Iwai <tiwai@suse.de> | 2019-04-09 18:04:17 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2019-04-09 18:54:13 +0200 |
| commit | 2eabc5ec8ab4d4748a82050dfcb994119b983750 (patch) | |
| tree | 13103ccf8a6c0f07e9200403fcd26a30b30200c6 /scripts/Makefile.modinst | |
| parent | feb689025fbb6f0aa6297d3ddf97de945ea4ad32 (diff) | |
| download | lwn-2eabc5ec8ab4d4748a82050dfcb994119b983750.tar.gz lwn-2eabc5ec8ab4d4748a82050dfcb994119b983750.zip | |
ALSA: seq: Fix race of get-subscription call vs port-delete ioctls
The snd_seq_ioctl_get_subscription() retrieves the port subscriber
information as a pointer, while the object isn't protected, hence it
may be deleted before the actual reference. This race was spotted by
syzkaller and may lead to a UAF.
The fix is simply copying the data in the lookup function that
performs in the rwsem to protect against the deletion.
Reported-by: syzbot+9437020c82413d00222d@syzkaller.appspotmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'scripts/Makefile.modinst')
0 files changed, 0 insertions, 0 deletions