From: SeungJu Cheon <suunj1331@gmail.com> mainline inclusion from mainline-v7.1-rc2 commit d1f73f169c1014463b5060e3f60813e13ddc7b87 category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/15431 CVE: CVE-2026-46184 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- Add a missing sanity check for bNrChannels in detect_usb_format() to prevent a division by zero in playback_urb_complete() and capture_urb_complete(). USB core does not validate class-specific descriptor fields such as bNrChannels, so drivers must verify them before use. If a device provides bNrChannels = 0, frame_bytes becomes zero and is later used as a divisor in the URB completion handlers, leading to a kernel crash. Fixes: 63978ab3e3e9 ("sound: add Edirol UA-101 support") Cc: stable@vger.kernel.org Signed-off-by: SeungJu Cheon <suunj1331@gmail.com> Link: https://patch.msgid.link/20260426111239.103296-1-suunj1331@gmail.com Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Yin Tirui <yintirui@huawei.com> --- sound/usb/misc/ua101.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/sound/usb/misc/ua101.c b/sound/usb/misc/ua101.c index 5dd1cbe29d12..e9ce9f903cc6 100644 --- a/sound/usb/misc/ua101.c +++ b/sound/usb/misc/ua101.c @@ -995,6 +995,13 @@ static int detect_usb_format(struct ua101 *ua) ua->capture.channels = fmt_capture->bNrChannels; ua->playback.channels = fmt_playback->bNrChannels; + if (!ua->capture.channels || !ua->playback.channels) { + dev_err(&ua->dev->dev, + "invalid channel count: capture %u, playback %u\n", + ua->capture.channels, ua->playback.channels); + return -EINVAL; + } + ua->capture.frame_bytes = fmt_capture->bSubframeSize * ua->capture.channels; ua->playback.frame_bytes = -- 2.43.0