tree bad7a21d6c43925fe4e7102f9816847ed133e775
parent 0e47c969c65e213421450c31043353ebe3c67e0c
author Jan Kara <jack@suse.cz> 1390930164 +0100
committer Jan Kara <jack@suse.cz> 1391000224 +0100

fanotify: Fix use after free in mask checking

We cannot use the event structure returned from
fsnotify_add_notify_event() because that event can be freed by the time
that function returns. Use the mask argument passed into the event
handler directly instead. This also fixes a possible problem when we
could unnecessarily wait for permission response for a normal fanotify
event which got merged with a permission event.

We also disallow merging of permission event with any other event so
that we know the permission event which we just created is the one on
which we should wait for permission response.

Reported-and-tested-by: Jiri Kosina <jkosina@suse.cz>
Reported-and-tested-by: Dave Jones <davej@fedoraproject.org>
Signed-off-by: Jan Kara <jack@suse.cz>