Jan Kara 5838d4442b fanotify: fix double free of pending permission events ... Commit 8581679424 ("fanotify: Fix use after free for permission events") introduced a double free issue for permission events which are pending in group's notification queue while group is being destroyed. These events are freed from fanotify_handle_event() but they are not removed from groups notification queue and thus they get freed again from fsnotify_flush_notify(). Fix the problem by removing permission events from notification queue before freeing them if we skip processing access response. Also expand comments in fanotify_release() to explain group shutdown in detail. Fixes: 8581679424 Signed-off-by: Jan Kara <jack@suse.cz> Reported-by: Douglas Leeder <douglas.leeder@sophos.com> Tested-by: Douglas Leeder <douglas.leeder@sophos.com> Reported-by: Heinrich Schuchard <xypron.glpk@gmx.de> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2014-08-06 18:01:12 -07:00
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fanotify_user.c	fanotify: fix double free of pending permission events	2014-08-06 18:01:12 -07:00
fanotify.c	fanotify: fix double free of pending permission events	2014-08-06 18:01:12 -07:00
fanotify.h	fanotify: use fanotify event structure for permission response processing	2014-04-03 16:20:51 -07:00
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