From: Takashi Iwai tiwai@suse.de
[ Upstream commit 05a1fc5efdd8560f34a3af39c9cf1e1526cc3ddf ]
The PCM stream data in USB-audio driver is transferred over USB URB packet buffers, and each packet size is determined dynamically. The packet sizes are limited by some factors such as wMaxPacketSize USB descriptor. OTOH, in the current code, the actually used packet sizes are determined only by the rate and the PPS, which may be bigger than the size limit above. This results in a buffer overflow, as reported by syzbot.
Basically when the limit is smaller than the calculated packet size, it implies that something is wrong, most likely a weird USB descriptor. So the best option would be just to return an error at the parameter setup time before doing any further operations.
This patch introduces such a sanity check, and returns -EINVAL when the packet size is greater than maxpacksize. The comparison with ep->packsize[1] alone should suffice since it's always equal or greater than ep->packsize[0].
Reported-by: syzbot+bfd77469c8966de076f7@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=bfd77469c8966de076f7 Link: https://lore.kernel.org/690b6b46.050a0220.3d0d33.0054.GAE@google.com Cc: Lizhi Xu lizhi.xu@windriver.com Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20251109091211.12739-1-tiwai@suse.de Signed-off-by: Takashi Iwai tiwai@suse.de [ changed ep->cur_rate to rate parameter and chip to ep->chip ] Signed-off-by: Sasha Levin sashal@kernel.org --- sound/usb/endpoint.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c index 80dcac5abe0c4..21bcdc811a810 100644 --- a/sound/usb/endpoint.c +++ b/sound/usb/endpoint.c @@ -1093,6 +1093,11 @@ int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep, ep->sample_rem = rate % ep->pps; ep->packsize[0] = rate / ep->pps; ep->packsize[1] = (rate + (ep->pps - 1)) / ep->pps; + if (ep->packsize[1] > ep->maxpacksize) { + usb_audio_dbg(ep->chip, "Too small maxpacksize %u for rate %u / pps %u\n", + ep->maxpacksize, rate, ep->pps); + return -EINVAL; + }
/* calculate the frequency in 16.16 format */ ep->freqm = ep->freqn;