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

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

commit f6ab594672d4cba08540919a4e6be2e202b60007 upstream.

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: 2908d778ab3e ("[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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>