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Takashi Iwai authored
ALSA PCM core recently introduced a new managed PCM buffer allocation mode that does allocate / free automatically at hw_params and hw_free. However, it overlooked the code path directly calling hw_free PCM ops at releasing the PCM substream, and it may result in a memory leak as spotted by syzkaller when no buffer preallocation is used (e.g. vmalloc buffer). This patch papers over it with a slight refactoring. The hw_free ops call and relevant tasks are unified in a new helper function, and call it from both places. Fixes: 0dba808e ("ALSA: pcm: Introduce managed buffer allocation mode") Reported-by: syzbot+30edd0f34bfcdc548ac4@syzkaller.appspotmail.com Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20200129195907.12197-1-tiwai@suse.deSigned-off-by:
Takashi Iwai <tiwai@suse.de>
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