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scsi: aic94xx: fix use-after-free in device removal path

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The asd_pci_remove() function fails to synchronize with pending tasklets
before freeing the asd_ha structure, leading to a potential
use-after-free vulnerability.

When a device removal is triggered (via hot-unplug or module unload),
race condition can occur.

The fix adds tasklet_kill() before freeing the asd_ha structure,
ensuring all scheduled tasklets complete before cleanup proceeds.

Reported-by: Yuhao Jiang <danisjiang@gmail.com>
Reported-by: Junrui Luo <moonafterrain@outlook.com>
Fixes: 2908d778ab ("[SCSI] aic94xx: new driver")
Cc: stable@vger.kernel.org
Signed-off-by: Junrui Luo <moonafterrain@outlook.com>
Link: https://patch.msgid.link/ME2PR01MB3156AB7DCACA206C845FC7E8AFFDA@ME2PR01MB3156.ausprd01.prod.outlook.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Junrui Luo
2025-10-29 00:29:04 +08:00
committed by Martin K. Petersen
parent d204087a59
commit f6ab594672
1 changed files with 3 additions and 0 deletions
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3
drivers/scsi/aic94xx/aic94xx_init.c
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@@ -882,6 +882,9 @@ static void asd_pci_remove(struct pci_dev *dev)
asd_disable_ints(asd_ha);
/* Ensure all scheduled tasklets complete before freeing resources */
tasklet_kill(&asd_ha->seq.dl_tasklet);
asd_remove_dev_attrs(asd_ha);
/* XXX more here as needed */