Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: loop: Fix use-after-free issues do_req_filebacked() calls blk_mq_complete_request() synchronously or asynchronously when using asynchronous I/O unless memory allocation fails. Hence, modify loop_handle_cmd() such that it does not dereference 'cmd' nor 'rq' after do_req_filebacked() finished unless we are sure that the request has not yet been completed. This patch fixes the following kernel crash: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000054 Call trace: css_put.42938+0x1c/0x1ac loop_process_work+0xc8c/0xfd4 loop_rootcg_workfn+0x24/0x34 process_one_work+0x244/0x558 worker_thread+0x400/0x8fc kthread+0x16c/0x1e0 ret_from_fork+0x10/0x20
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6 before 407badf73ec9fb0d5744bf2ca1745c1818aa222f; affected bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6 before e3fda704903f6d1fc351412f1bc6620333959ada; affected bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6 before 6917395c4667cfb607ed8bf1826205a59414657c; affected bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6 before 9b0cb770f5d7b1ff40bea7ca385438ee94570eec |
| Linux / Linux | affected 4.4; unaffected 0 before 4.4; unaffected 5.15.104 through 5.15.*; unaffected 6.1.21 through 6.1.*; unaffected 6.2.8 through 6.2.*; unaffected 6.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/407badf73ec9fb0d5744bf2ca1745c1818aa222f
- https://git.kernel.org/stable/c/e3fda704903f6d1fc351412f1bc6620333959ada
- https://git.kernel.org/stable/c/6917395c4667cfb607ed8bf1826205a59414657c
- https://git.kernel.org/stable/c/9b0cb770f5d7b1ff40bea7ca385438ee94570eec
ADP enrichment
No English description supplied.
No references supplied.