An issue was discovered in drivers/media/dvb-core/dvb_frontend.c in the Linux kernel 6.2. There is a blocking operation when a task is in !TASK_RUNNING. In dvb_frontend_get_event, wait_event_interruptible is called; the condition is dvb_frontend_test_event(fepriv,events). In dvb_frontend_test_event, down(&fepriv->sem) is called. However, wait_event_interruptible would put the process to sleep, and down(&fepriv->sem) may block the process.
The product contains multiple threads or executable segments that are waiting for each other to release a necessary lock, resulting in deadlock.
| Link | Tags |
|---|---|
| https://lore.kernel.org/all/CA+UBctCu7fXn4q41O_3=id1+OdyQ85tZY1x+TkT-6OVBL6KAUw%40mail.gmail.com/ | |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AOATNX5UFL7V7W2QDIQKOHFFHYKWFP4W/ | vendor advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6HIEOLEOURP4BJZMIL7UGGPYRRB44UDN/ | vendor advisory |
| https://www.debian.org/security/2023/dsa-5448 | third party advisory vendor advisory |
| https://lists.debian.org/debian-lts-announce/2023/07/msg00030.html | third party advisory mailing list |
| https://www.debian.org/security/2023/dsa-5480 | third party advisory vendor advisory |
| https://security.netapp.com/advisory/ntap-20230929-0003/ | third party advisory |
| https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html | third party advisory mailing list |
| https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b8c75e4a1b325ea0a9433fa8834be97b5836b946 |