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ALSA: usb-audio: Fix an out-of-bounds bug in __snd_usb_parse_audio_interface()
commit e53f47f6c1
upstream.
There may be a bad USB audio device with a USB ID of (0x04fa, 0x4201) and
the number of it's interfaces less than 4, an out-of-bounds read bug occurs
when parsing the interface descriptor for this device.
Fix this by checking the number of interfaces.
Signed-off-by: Dongxiang Ke <kdx.glider@gmail.com>
Link: https://lore.kernel.org/r/20220906024928.10951-1-kdx.glider@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 1 additions and 1 deletions
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@ -502,7 +502,7 @@ int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
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* Dallas DS4201 workaround: It presents 5 altsettings, but the last
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* one misses syncpipe, and does not produce any sound.
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*/
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if (chip->usb_id == USB_ID(0x04fa, 0x4201))
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if (chip->usb_id == USB_ID(0x04fa, 0x4201) && num >= 4)
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num = 4;
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for (i = 0; i < num; i++) {
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