Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: writeback: avoid use-after-free after removing device When a disk is removed, bdi_unregister gets called to stop further writeback and wait for associated delayed work to complete. However, wb_inode_writeback_end() may schedule bandwidth estimation dwork after this has completed, which can result in the timer attempting to access the just freed bdi_writeback. Fix this by checking if the bdi_writeback is alive, similar to when scheduling writeback work. Since this requires wb->work_lock, and wb_inode_writeback_end() may get called from interrupt, switch wb->work_lock to an irqsafe lock.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 45a2966fd64147518dc5bca25f447bd0fb5359ac before f96b9f7c1676923bce871e728bb49c0dfa5013cc; affected 45a2966fd64147518dc5bca25f447bd0fb5359ac before 9a6c710f3bc10bc9cc23e1c080b53245b7f9d5b7; affected 45a2966fd64147518dc5bca25f447bd0fb5359ac before f87904c075515f3e1d8f4a7115869d3b914674fd |
| Linux / Linux | affected 5.15; unaffected 0 before 5.15; unaffected 5.15.64 through 5.15.*; unaffected 5.19.6 through 5.19.*; unaffected 6.0 through * |
CWE
No CWE identifiers supplied.