ALSA: pcm: Add sanity NULL check for the default mmap fault handler

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commit d2913a07d9 upstream.

A driver might allow the mmap access before initializing its
runtime->dma_area properly.  Add a proper NULL check before passing to
virt_to_page() for avoiding a panic.

Reported-by: syzbot+4bf62a7b1d0f4fdb7ae2@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Link: https://patch.msgid.link/20241120141104.7060-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Takashi Iwai 2024-11-20 15:11:02 +01:00 • committed by Greg Kroah-Hartman

parent 0357abf951

commit bc200027ee

1 changed files with 4 additions and 2 deletions

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sound/core/pcm_native.c

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