scsi: qla2xxx: Fix queue teardown NULL dma_free and bitmap locking
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.6.160, 6.12.112, 6.18.53, 7.2.7
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Fix queue teardown NULL dma_free and bitmap locking qla25xx_free_req_que() and qla25xx_free_rsp_que() have two pre-existing bugs exposed on the error path of qla25xx_create_{req,rsp}_que(): 1. When dma_alloc_coherent() fails during queue creation, the error path calls the free function with req->ring / rsp->ring still NULL (from kzalloc). The unconditional dma_free_coherent() with a NULL cpu_addr is undefined behavior and can panic. 2. The free functions clear req_qid_map / rsp_qid_map under vport_lock, but the create functions protect the same bitmaps with mq_lock. This provides no mutual exclusion. Additionally, the create error path clears the bit and releases mq_lock before calling the free function, creating a window where another thread can allocate the same que_id and have its ha->req_q_map entry clobbered by the subsequent lockless NULL assignment in the free function. Fix by: • Guarding dma_free_coherent() with a NULL check on the ring pointer. • Using mq_lock (the lock held by all creators) in the free functions to atomically NULL the map entry and clear the bitmap bit. • Removing the now-redundant clear_bit blocks from the create error paths since the free functions handle it atomically.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From 73208dfd7ab19f379d73e8a0fbf30f92c203e5e8 · fixed in 2e6f60adf609c77e828f64e0cd371920bef91c12; From 73208dfd7ab19f379d73e8a0fbf30f92c203e5e8 · fixed in 56e25d716833604fd5bff388e472f290bfe793aa; From 73208dfd7ab19f379d73e8a0fbf30f92c203e5e8 · fixed in f35cb67f2092b49d7949065dd56895ed47238f22; From 73208dfd7ab19f379d73e8a0fbf30f92c203e5e8 · fixed in 94fc0c5b45de2bf3a691619bcfd10b9a49fc647e; From 73208dfd7ab19f379d73e8a0fbf30f92c203e5e8 · fixed in 34a40e0dff940ac5eba494a69b553ea571e24873
- Linux Linux
2.6.29
- KernelLinux
From 2.6.29 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.112; From 6.13.0 · fixed in 6.18.53; From 6.19.0 · fixed in 7.2.7