CVE-2026-97537scsi: qla2xxx: Fix queue teardown NULL dma_free and bitmap locking

Official description

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.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/b65e3a82f77b7a63e386623d2ea70d2b5580295a
• https://git.kernel.org/stable/c/a9ff85886425355c72749be6090758aa19a89f16
• https://git.kernel.org/stable/c/81ee4df2a488f0909f7ff563e88a0e0099485a8b
• https://git.kernel.org/stable/c/2e6f60adf609c77e828f64e0cd371920bef91c12
• https://git.kernel.org/stable/c/56e25d716833604fd5bff388e472f290bfe793aa
• https://git.kernel.org/stable/c/f35cb67f2092b49d7949065dd56895ed47238f22
• https://git.kernel.org/stable/c/94fc0c5b45de2bf3a691619bcfd10b9a49fc647e
• https://git.kernel.org/stable/c/34a40e0dff940ac5eba494a69b553ea571e24873