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authorTakashi Iwai <tiwai@suse.de>2016-02-16 16:15:59 +0300
committerTakashi Iwai <tiwai@suse.de>2016-02-16 16:37:19 +0300
commit13d5e5d4725c64ec06040d636832e78453f477b7 (patch)
tree60f260262d588d1d4ba08b1b2907fbde23dca5a7 /arch/arm/mach-zx
parent0b8c82190c12e530eb6003720dac103bf63e146e (diff)
downloadlinux-13d5e5d4725c64ec06040d636832e78453f477b7.tar.xz
ALSA: seq: Fix double port list deletion
The commit [7f0973e973cd: ALSA: seq: Fix lockdep warnings due to double mutex locks] split the management of two linked lists (source and destination) into two individual calls for avoiding the AB/BA deadlock. However, this may leave the possible double deletion of one of two lists when the counterpart is being deleted concurrently. It ends up with a list corruption, as revealed by syzkaller fuzzer. This patch fixes it by checking the list emptiness and skipping the deletion and the following process. BugLink: http://lkml.kernel.org/r/CACT4Y+bay9qsrz6dQu31EcGaH9XwfW7o3oBzSQUG9fMszoh=Sg@mail.gmail.com Fixes: 7f0973e973cd ('ALSA: seq: Fix lockdep warnings due to 'double mutex locks) Reported-by: Dmitry Vyukov <dvyukov@google.com> Tested-by: Dmitry Vyukov <dvyukov@google.com> Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'arch/arm/mach-zx')
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