CVE-2022-49217

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> scsi: pm8001: Fix abort all task initialization<br /> <br /> In pm80xx_send_abort_all(), the n_elem field of the ccb used is not<br /> initialized to 0. This missing initialization sometimes lead to the task<br /> completion path seeing the ccb with a non-zero n_elem resulting in the<br /> execution of invalid dma_unmap_sg() calls in pm8001_ccb_task_free(),<br /> causing a crash such as:<br /> <br /> [ 197.676341] RIP: 0010:iommu_dma_unmap_sg+0x6d/0x280<br /> [ 197.700204] RSP: 0018:ffff889bbcf89c88 EFLAGS: 00010012<br /> [ 197.705485] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff83d0bda0<br /> [ 197.712687] RDX: 0000000000000002 RSI: 0000000000000000 RDI: ffff88810dffc0d0<br /> [ 197.719887] RBP: 0000000000000000 R08: 0000000000000000 R09: ffff8881c790098b<br /> [ 197.727089] R10: ffffed1038f20131 R11: 0000000000000001 R12: 0000000000000000<br /> [ 197.734296] R13: ffff88810dffc0d0 R14: 0000000000000010 R15: 0000000000000000<br /> [ 197.741493] FS: 0000000000000000(0000) GS:ffff889bbcf80000(0000) knlGS:0000000000000000<br /> [ 197.749659] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br /> [ 197.755459] CR2: 00007f16c1b42734 CR3: 0000000004814000 CR4: 0000000000350ee0<br /> [ 197.762656] Call Trace:<br /> [ 197.765127] <br /> [ 197.767162] pm8001_ccb_task_free+0x5f1/0x820 [pm80xx]<br /> [ 197.772364] ? do_raw_spin_unlock+0x54/0x220<br /> [ 197.776680] pm8001_mpi_task_abort_resp+0x2ce/0x4f0 [pm80xx]<br /> [ 197.782406] process_oq+0xe85/0x7890 [pm80xx]<br /> [ 197.786817] ? lock_acquire+0x194/0x490<br /> [ 197.790697] ? handle_irq_event+0x10e/0x1b0<br /> [ 197.794920] ? mpi_sata_completion+0x2d70/0x2d70 [pm80xx]<br /> [ 197.800378] ? __wake_up_bit+0x100/0x100<br /> [ 197.804340] ? lock_is_held_type+0x98/0x110<br /> [ 197.808565] pm80xx_chip_isr+0x94/0x130 [pm80xx]<br /> [ 197.813243] tasklet_action_common.constprop.0+0x24b/0x2f0<br /> [ 197.818785] __do_softirq+0x1b5/0x82d<br /> [ 197.822485] ? do_raw_spin_unlock+0x54/0x220<br /> [ 197.826799] __irq_exit_rcu+0x17e/0x1e0<br /> [ 197.830678] irq_exit_rcu+0xa/0x20<br /> [ 197.834114] common_interrupt+0x78/0x90<br /> [ 197.840051] <br /> [ 197.844236] <br /> [ 197.848397] asm_common_interrupt+0x1e/0x40<br /> <br /> Avoid this issue by always initializing the ccb n_elem field to 0 in<br /> pm8001_send_abort_all(), pm8001_send_read_log() and<br /> pm80xx_send_abort_all().