CVE-2024-42287

In the Linux kernel, the following vulnerability has been resolved:

scsi: qla2xxx: Complete command early within lock

A crash was observed while performing NPIV and FW reset,

BUG: kernel NULL pointer dereference, address: 000000000000001c

#PF: supervisor read access in kernel mode

#PF: error_code(0x0000) - not-present page

PGD 0 P4D 0

Oops: 0000 1 PREEMPT_RT SMP NOPTI

RIP: 0010:dma_direct_unmap_sg+0x51/0x1e0

RSP: 0018:ffffc90026f47b88 EFLAGS: 00010246

RAX: 0000000000000000 RBX: 0000000000000021 RCX: 0000000000000002

RDX: 0000000000000021 RSI: 0000000000000000 RDI: ffff8881041130d0

RBP: ffff8881041130d0 R08: 0000000000000000 R09: 0000000000000034

R10: ffffc90026f47c48 R11: 0000000000000031 R12: 0000000000000000

R13: 0000000000000000 R14: ffff8881565e4a20 R15: 0000000000000000

FS: 00007f4c69ed3d00(0000) GS:ffff889faac80000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 000000000000001c CR3: 0000000288a50002 CR4: 00000000007706e0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

PKRU: 55555554

Call Trace:

<TASK>

? __die_body+0x1a/0x60

? page_fault_oops+0x16f/0x4a0

? do_user_addr_fault+0x174/0x7f0

? exc_page_fault+0x69/0x1a0

? asm_exc_page_fault+0x22/0x30

? dma_direct_unmap_sg+0x51/0x1e0

? preempt_count_sub+0x96/0xe0

qla2xxx_qpair_sp_free_dma+0x29f/0x3b0 [qla2xxx]

qla2xxx_qpair_sp_compl+0x60/0x80 [qla2xxx]

__qla2x00_abort_all_cmds+0xa2/0x450 [qla2xxx]

The command completion was done early while aborting the commands in driver

unload path but outside lock to avoid the WARN_ON condition of performing

dma_free_attr within the lock. However this caused race condition while

command completion via multiple paths causing system crash.

Hence complete the command early in unload path but within the lock to

avoid race condition.