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authorJan Kara <jack@suse.cz>2014-08-06 16:03:28 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-06 18:01:12 -0700
commit5838d4442bd5971687b72221736222637e03140d (patch)
treee639967a7baf1b1c6a0d1b5e0babc8083c7faad4 /Makefile
parent8ba8fa917093510cdcb4ec8ff8b9603e1b525658 (diff)
downloadlwn-5838d4442bd5971687b72221736222637e03140d.tar.gz
lwn-5838d4442bd5971687b72221736222637e03140d.zip
fanotify: fix double free of pending permission events
Commit 85816794240b ("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: 85816794240b9659e66e4d9b0df7c6e814e5f603 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>
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