scsi: qla2xxx: Fix double free of fcport

The server was crashing after LOGO because fcport was getting freed twice.

 -----------[ cut here ]-----------
 kernel BUG at mm/slub.c:371!
 invalid opcode: 0000 1 SMP PTI
 CPU: 35 PID: 4610 Comm: bash Kdump: loaded Tainted: G OE --------- - - 4.18.0-425.3.1.el8.x86_64 #1
 Hardware name: HPE ProLiant DL360 Gen10/ProLiant DL360 Gen10, BIOS U32 09/03/2021
 RIP: 0010:set_freepointer.part.57+0x0/0x10
 RSP: 0018:ffffb07107027d90 EFLAGS: 00010246
 RAX: ffff9cb7e3150000 RBX: ffff9cb7e332b9c0 RCX: ffff9cb7e3150400
 RDX: 0000000000001f37 RSI: 0000000000000000 RDI: ffff9cb7c0005500
 RBP: fffff693448c5400 R08: 0000000080000000 R09: 0000000000000009
 R10: 0000000000000000 R11: 0000000000132af0 R12: ffff9cb7c0005500
 R13: ffff9cb7e3150000 R14: ffffffffc06990e0 R15: ffff9cb7ea85ea58
 FS: 00007ff6b79c2740(0000) GS:ffff9cb8f7ec0000(0000) knlGS:0000000000000000
 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 000055b426b7d700 CR3: 0000000169c18002 CR4: 00000000007706e0
 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
 PKRU: 55555554
 Call Trace:
 kfree+0x238/0x250
 qla2x00_els_dcmd_sp_free+0x20/0x230 [qla2xxx]
 ? qla24xx_els_dcmd_iocb+0x607/0x690 [qla2xxx]
 qla2x00_issue_logo+0x28c/0x2a0 [qla2xxx]
 ? qla2x00_issue_logo+0x28c/0x2a0 [qla2xxx]
 ? kernfs_fop_write+0x11e/0x1a0

Remove one of the free calls and add check for valid fcport. Also use
function qla2x00_free_fcport() instead of kfree().

Cc: [email protected]
Signed-off-by: Saurav Kashyap <[email protected]>
Signed-off-by: Nilesh Javali <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Himanshu Madhani <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: Saurav Kashyap

drivers/scsi/qla2xxx/qla_iocb.c

@@ -2637,7 +2637,8 @@ static void qla2x00_els_dcmd_sp_free(srb_t *sp)
 {
 	struct srb_iocb *elsio = &sp->u.iocb_cmd;
 
-	kfree(sp->fcport);
+	if (sp->fcport)
+		qla2x00_free_fcport(sp->fcport);
 
 	if (elsio->u.els_logo.els_logo_pyld)
 		dma_free_coherent(&sp->vha->hw->pdev->dev, DMA_POOL_SIZE,
@@ -2750,6 +2751,7 @@ qla24xx_els_dcmd_iocb(scsi_qla_host_t *vha, int els_opcode,
 	if (!elsio->u.els_logo.els_logo_pyld) {
 		/* ref: INIT */
 		kref_put(&sp->cmd_kref, qla2x00_sp_release);
+		qla2x00_free_fcport(fcport);
 		return QLA_FUNCTION_FAILED;
 	}
 
@@ -2784,7 +2786,6 @@ qla24xx_els_dcmd_iocb(scsi_qla_host_t *vha, int els_opcode,
 	    fcport->d_id.b.area, fcport->d_id.b.al_pa);
 
 	wait_for_completion(&elsio->u.els_logo.comp);
-	qla2x00_free_fcport(fcport);
 
 	/* ref: INIT */
 	kref_put(&sp->cmd_kref, qla2x00_sp_release);