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scsi: qla2xxx: Hold vport reference in qla24xx_report_id_acquisition()

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In the format 1 path, the virtual port is located on ha->vp_list while
holding vport_slock, but the lock is dropped before vp is used:
qla_update_host_map() is called and VP_IDX_ACQUIRED/REGISTER_FC4_NEEDED/
REGISTER_FDMI_NEEDED are set on vp. No reference is taken across that
window, so a concurrent qla24xx_deallocate_vp_id() can tear the vport
down and free it, leading to a use-after-free.

Take a vport reference (vref_count) under vport_slock when the matching
vp is found, and drop it after the last use of
vp. qla24xx_deallocate_vp_id() waits for vref_count to reach zero before
unlinking and freeing the vport, so the pointer stays valid. This
matches the reference idiom already used by the other ha->vp_list
traversals.

Fixes: 2c3dfe3f6a ("[SCSI] qla2xxx: add support for NPIV")
Cc: stable@vger.kernel.org
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Reviewed-by: Hannes Reinecke <hare@kernel.org>
Link: https://patch.msgid.link/20260723050413.3897522-51-njavali@marvell.com
Signed-off-by: Martin K. Petersen (Oracle) <mkp@kernel.org>
This commit is contained in:
Nilesh Javali
2026-07-23 10:34:07 +05:30
committed by Martin K. Petersen (Oracle)
parent 9101c51649
commit 793cedee29
1 changed files with 3 additions and 0 deletions
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3
drivers/scsi/qla2xxx/qla_mbx.c
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@@ -4267,6 +4267,7 @@ qla24xx_report_id_acquisition(scsi_qla_host_t *vha, void *pkt)
list_for_each_entry(vp, &ha->vp_list, list) {
if (vp_idx == vp->vp_idx) {
found = 1;
atomic_inc(&vp->vref_count);
break;
}
}
@@ -4284,6 +4285,8 @@ qla24xx_report_id_acquisition(scsi_qla_host_t *vha, void *pkt)
set_bit(VP_IDX_ACQUIRED, &vp->vp_flags);
set_bit(REGISTER_FC4_NEEDED, &vp->dpc_flags);
set_bit(REGISTER_FDMI_NEEDED, &vp->dpc_flags);
atomic_dec(&vp->vref_count);
}
set_bit(VP_DPC_NEEDED, &vha->dpc_flags);
qla2xxx_wake_dpc(vha);