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X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: dlt+3UHcUp8N9x30LQ5ww+ut9LT9xGF9PAKYs68Mgh/1njHHr7EQrtqwLYqmq6g+m97WfB/tIX8Y1/EwK2F2jFG/YMVG4q+f0iuQIhEoWGMqWiYor2jilmuP1dVWvJvz X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR10MB4306 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2024-12-17_03,2024-12-16_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 phishscore=0 malwarescore=0 bulkscore=0 spamscore=0 mlxlogscore=999 suspectscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2411120000 definitions=main-2412170051 X-Proofpoint-GUID: nuP7ziyMtPQPrp_YYqZinZ85F2bzse78 X-Proofpoint-ORIG-GUID: nuP7ziyMtPQPrp_YYqZinZ85F2bzse78 Hi Sasha, On 28/07/24 21:38, Sasha Levin wrote: > From: Takashi Iwai > > [ Upstream commit 2f38cf730caedaeacdefb7ff35b0a3c1168117f9 ] > > A malformed USB descriptor may pass the lengthy mixer description with > a lot of channels, and this may overflow the 32bit integer shift > size, as caught by syzbot UBSAN test. Although this won't cause any > real trouble, it's better to address. > > This patch introduces a sanity check of the number of channels to bail > out the parsing when too many channels are found. > > Reported-by: syzbot+78d5b129a762182225aa@syzkaller.appspotmail.com > Closes: https://lore.kernel.org/0000000000000adac5061d3c7355@google.com > Link: https://patch.msgid.link/20240715123619.26612-1-tiwai@suse.de > Signed-off-by: Takashi Iwai > Signed-off-by: Sasha Levin FYI: This 13 patch series and similar AUTOSEL sets for other stable kernels didn't go into stable yet. Thanks, Harshit > --- > sound/usb/mixer.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c > index d818eee53c90a..f10634dc118d6 100644 > --- a/sound/usb/mixer.c > +++ b/sound/usb/mixer.c > @@ -1985,6 +1985,13 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid, > bmaControls = ftr->bmaControls; > } > > + if (channels > 32) { > + usb_audio_info(state->chip, > + "usbmixer: too many channels (%d) in unit %d\n", > + channels, unitid); > + return -EINVAL; > + } > + > /* parse the source unit */ > err = parse_audio_unit(state, hdr->bSourceID); > if (err < 0)