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Subject[PATCH][next] scsi: qla2xxx: fix null pointer dereference on null_fcport
Date
From: Colin Ian King <colin.king@canonical.com>

Currently several error exit return paths end up passing a null
new_fcport pointer to function qla2x00_free_fcport and this causes
a null pointer dereference. Fix this by moving and renaming the
exit path label to be after the call to qla2x00_free_fcport to avoid
the errorneous and unnecessary call to qla2x00_free_fcport.

Addresses-Coverity: ("Dereference after null check")
Fixes: 3dae220595ba ("scsi: qla2xxx: Use common routine to free fcport struct")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
drivers/scsi/qla2xxx/qla_init.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
index a5076f43edea..ed056626d7a3 100644
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -5108,7 +5108,7 @@ qla2x00_configure_local_loop(scsi_qla_host_t *vha)
rval = qla2x00_get_id_list(vha, ha->gid_list, ha->gid_list_dma,
&entries);
if (rval != QLA_SUCCESS)
- goto cleanup_allocation;
+ goto exit;

ql_dbg(ql_dbg_disc, vha, 0x2011,
"Entries in ID list (%d).\n", entries);
@@ -5138,7 +5138,7 @@ qla2x00_configure_local_loop(scsi_qla_host_t *vha)
ql_log(ql_log_warn, vha, 0x2012,
"Memory allocation failed for fcport.\n");
rval = QLA_MEMORY_ALLOC_FAILED;
- goto cleanup_allocation;
+ goto exit;
}
new_fcport->flags &= ~FCF_FABRIC_DEVICE;

@@ -5228,7 +5228,7 @@ qla2x00_configure_local_loop(scsi_qla_host_t *vha)
ql_log(ql_log_warn, vha, 0xd031,
"Failed to allocate memory for fcport.\n");
rval = QLA_MEMORY_ALLOC_FAILED;
- goto cleanup_allocation;
+ goto exit;
}
spin_lock_irqsave(&vha->hw->tgt.sess_lock, flags);
new_fcport->flags &= ~FCF_FABRIC_DEVICE;
@@ -5239,7 +5239,6 @@ qla2x00_configure_local_loop(scsi_qla_host_t *vha)
/* Base iIDMA settings on HBA port speed. */
fcport->fp_speed = ha->link_data_rate;

- found_devs++;
}

list_for_each_entry(fcport, &vha->vp_fcports, list) {
@@ -5271,9 +5270,9 @@ qla2x00_configure_local_loop(scsi_qla_host_t *vha)
qla24xx_fcport_handle_login(vha, fcport);
}

-cleanup_allocation:
qla2x00_free_fcport(new_fcport);

+exit:
if (rval != QLA_SUCCESS) {
ql_dbg(ql_dbg_disc, vha, 0x2098,
"Configure local loop error exit: rval=%x.\n", rval);
--
2.24.0
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