CVE: CVE-2024-26931
Published: 2024-05-01
Description: In the Linux kernel, the following vulnerability has been resolved:

scsi: qla2xxx: Fix command flush on cable pull

System crash due to command failed to flush back to SCSI layer.

 BUG: unable to handle kernel NULL pointer dereference at [PII_REDACTED]
 PGD 0 P4D 0
 Oops: 0000 [#1] SMP NOPTI
 CPU: 27 PID: 793455 Comm: kworker/u130:6 Kdump: loaded Tainted: G           OE    --------- -  - 4.18.0-372.9.1.el8.x86_64 #1
 Hardware name: HPE ProLiant DL360 Gen10/ProLiant DL360 Gen10, BIOS U32 09/03/2021
 Workqueue: nvme-wq nvme_fc_connect_ctrl_work [nvme_fc]
 RIP: 0010:__wake_up_common+0x4c/0x190
 Code: 24 10 4d 85 c9 74 0a 41 f6 01 04 0f 85 9d 00 00 00 48 8b 43 08 48 83 c3 08 4c 8d 48 e8 49 8d 41 18 48 39 c3 0f 84 f0 00 00 00 <49> 8b 41 18 89 54 24 08 31 ed 4c 8d 70 e8 45 8b 29 41 f6 c5 04 75
 RSP: 0018:ffff95f3e0cb7cd0 EFLAGS: 00010086
 RAX: [PII_REDACTED] RBX: ffff8b08d3b26328 RCX: [PII_REDACTED]
 RDX: [PII_REDACTED] RSI: [PII_REDACTED] RDI: ffff8b08d3b26320
 RBP: [PII_REDACTED] R08: [PII_REDACTED] R09: ffffffffffffffe8
 R10: [PII_REDACTED] R11: ffff95f3e0cb7a60 R12: ffff95f3e0cb7d20
 R13: [PII_REDACTED] R14: [PII_REDACTED] R15: [PII_REDACTED]
 FS:  [PII_REDACTED](0000) GS:ffff8b2fdf6c0000(0000) knlGS:[PII_REDACTED]
 CS:  0010 DS: 0000 ES: 0000 CR0: [PII_REDACTED]
 CR2: [PII_REDACTED] CR3: 0000002f1e410002 CR4:[PII_REDACTED]7706e0
 DR0: [PII_REDACTED] DR1: [PII_REDACTED] DR2: [PII_REDACTED]
 DR3: [PII_REDACTED] DR6: 00000000fffe0ff0 DR7: [PII_REDACTED]
 PKRU: 55555554
 Call Trace:
  __wake_up_common_lock+0x7c/0xc0
  qla_nvme_ls_req+0x355/0x4c0 [qla2xxx]
 qla2xxx [0000:12:00.1]-f084:3: qlt_free_session_done: se_sess [PII_REDACTED] / sess ffff8ae1407ca000 from port 21:32:00:02:ac:07:ee:b8 loop_id 0x02 s_id 01:02:00 logout 1 keep 0 els_logo 0
 ? __nvme_fc_send_ls_req+0x260/0x380 [nvme_fc]
 qla2xxx [0000:12:00.1]-207d:3: FCPort 21:32:00:02:ac:07:ee:b8 state transitioned from ONLINE to LOST - portid=010200.
  ? nvme_fc_send_ls_req.constprop.42+0x1a/0x45 [nvme_fc]
 qla2xxx [0000:12:00.1]-2109:3: qla2x00_schedule_rport_del 21320002ac07eeb8. rport ffff8ae598122000 roles 1
 ? nvme_fc_connect_ctrl_work.cold.63+0x1e3/0xa7d [nvme_fc]
 qla2xxx [0000:12:00.1]-f084:3: qlt_free_session_done: se_sess [PII_REDACTED] / sess ffff8ae14801e000 from port 21:32:01:02:ad:f7:ee:b8 loop_id 0x04 s_id 01:02:01 logout 1 keep 0 els_logo 0
  ? __switch_to+0x10c/0x450
 ? process_one_work+0x1a7/0x360
 qla2xxx [0000:12:00.1]-207d:3: FCPort 21:32:01:02:ad:f7:ee:b8 state transitioned from ONLINE to LOST - portid=010201.
  ? worker_thread+0x1ce/0x390
  ? create_worker+0x1a0/0x1a0
 qla2xxx [0000:12:00.1]-2109:3: qla2x00_schedule_rport_del 21320102adf7eeb8. rport ffff8ae3b2312800 roles 70
  ? kthread+0x10a/0x120
 qla2xxx [0000:12:00.1]-2112:3: qla_nvme_unregister_remote_port: unregister remoteport on ffff8ae14801e[PII_REDACTED]2adf7eeb8
  ? set_kthread_struct+0x40/0x40
 qla2xxx [0000:12:00.1]-2110:3: remoteport_delete of ffff8ae14801e[PII_REDACTED]2adf7eeb8 completed.
  ? ret_from_fork+0x1f/0x40
 qla2xxx [0000:12:00.1]-f086:3: qlt_free_session_done: waiting for sess ffff8ae14801e000 logout

The system was under memory stress where driver was not able to allocate an
SRB to carry out error recovery of cable pull.  The failure to flush causes
upper layer to start modifying scsi_cmnd.  When the system frees up some
memory, the subsequent cable pull trigger another command flush. At this
point the driver access a null pointer when attempting to DMA unmap the
SGL.

Add a check to make sure commands are flush back on session tear down to
prevent the null pointer access.
CVSS Score: 5.5 (MEDIUM)
CWE: CWE-476
References: https://git.kernel.org/stable/c/09c0ac18cac206ed1218b1fe6c1a0918e5ea9211; https://git.kernel.org/stable/c/67b2d35853c2da25a8ca1c4190a5e96d3083c2ac; https://git.kernel.org/stable/c/8de1584ec4fe0ebea33c273036e7e0a05e65c81d