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authorJaved Hasan <jhasan@marvell.com>2021-05-12 00:25:33 -0700
committerMartin K. Petersen <martin.petersen@oracle.com>2021-05-14 22:55:17 -0400
commit73578af92a0fae6609b955fcc9113e50e413c80f (patch)
tree66e1ca6a5b4d7c77ef8e9c33a09e0d97f43c148e /drivers/scsi/qedf
parentd0b2b70eb12e9ffaf95e11b16b230a4e015a536c (diff)
scsi: qedf: Add pointer checks in qedf_update_link_speed()
The following trace was observed: [ 14.042059] Call Trace: [ 14.042061] <IRQ> [ 14.042068] qedf_link_update+0x144/0x1f0 [qedf] [ 14.042117] qed_link_update+0x5c/0x80 [qed] [ 14.042135] qed_mcp_handle_link_change+0x2d2/0x410 [qed] [ 14.042155] ? qed_set_ptt+0x70/0x80 [qed] [ 14.042170] ? qed_set_ptt+0x70/0x80 [qed] [ 14.042186] ? qed_rd+0x13/0x40 [qed] [ 14.042205] qed_mcp_handle_events+0x437/0x690 [qed] [ 14.042221] ? qed_set_ptt+0x70/0x80 [qed] [ 14.042239] qed_int_sp_dpc+0x3a6/0x3e0 [qed] [ 14.042245] tasklet_action_common.isra.14+0x5a/0x100 [ 14.042250] __do_softirq+0xe4/0x2f8 [ 14.042253] irq_exit+0xf7/0x100 [ 14.042255] do_IRQ+0x7f/0xd0 [ 14.042257] common_interrupt+0xf/0xf [ 14.042259] </IRQ> API qedf_link_update() is getting called from QED but by that time shost_data is not initialised. This results in a NULL pointer dereference when we try to dereference shost_data while updating supported_speeds. Add a NULL pointer check before dereferencing shost_data. Link: https://lore.kernel.org/r/20210512072533.23618-1-jhasan@marvell.com Fixes: 61d8658b4a43 ("scsi: qedf: Add QLogic FastLinQ offload FCoE driver framework.") Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com> Signed-off-by: Javed Hasan <jhasan@marvell.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/qedf')
-rw-r--r--drivers/scsi/qedf/qedf_main.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/scsi/qedf/qedf_main.c b/drivers/scsi/qedf/qedf_main.c
index 69f7784233f9..756231151882 100644
--- a/drivers/scsi/qedf/qedf_main.c
+++ b/drivers/scsi/qedf/qedf_main.c
@@ -536,7 +536,9 @@ static void qedf_update_link_speed(struct qedf_ctx *qedf,
if (linkmode_intersects(link->supported_caps, sup_caps))
lport->link_supported_speeds |= FC_PORTSPEED_20GBIT;
- fc_host_supported_speeds(lport->host) = lport->link_supported_speeds;
+ if (lport->host && lport->host->shost_data)
+ fc_host_supported_speeds(lport->host) =
+ lport->link_supported_speeds;
}
static void qedf_bw_update(void *dev)