scsi: qla2xxx: Fix improper freeing of purex item

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Fix improper freeing of purex item In qla2xxx_process_purls_iocb(), an item is allocated via qla27xx_copy_multiple_pkt(), which internally calls qla24xx_alloc_purex_item(). The qla24xx_alloc_purex_item() function may return a pre-allocated item from a per-adapter pool for small allocations, instead of dynamically allocating memory with kzalloc(). An error handling path in qla2xxx_process_purls_iocb() incorrectly uses kfree() to release the item. If the item was from the pre-allocated pool, calling kfree() on it is a bug that can lead to memory corruption. Fix this by using the correct deallocation function, qla24xx_free_purex_item(), which properly handles both dynamically allocated and pre-allocated items.

References

• https://git.kernel.org/stable/c/4bccd506a1f1ab01d1f45b2a3effff6bedc73cf9
• https://git.kernel.org/stable/c/8e9f0a0717ba31d5842721627ade1e62d7aec012
• https://git.kernel.org/stable/c/cfe3e2f768d248fd3d965d561d0768a56dd0b9f8
• https://git.kernel.org/stable/c/5fa1c8226b4532ad7011d295d3ab4ad45df105ae
• https://git.kernel.org/stable/c/78b1a242fe612a755f2158fd206ee6bb577d18ca