[ciqlts8_6] ALSA: usb-audio: Fix potential overflow of PCM transfer buffer#974
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roxanan1996 merged 1 commit intociqlts8_6from Mar 16, 2026
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jira VULN-161123 cve CVE-2025-40269 commit-author Takashi Iwai <tiwai@suse.de> commit 05a1fc5 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> (cherry picked from commit 05a1fc5) Signed-off-by: CIQ Kernel Automation <ciq_kernel_automation@ciq.com>
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shreeya-patel98
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Mar 16, 2026
roxanan1996
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Mar 16, 2026
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