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authorJohannes Thumshirn <jthumshirn@suse.de>2018-07-31 15:46:01 +0200
committerMartin K. Petersen <martin.petersen@oracle.com>2018-08-02 15:30:03 -0400
commit2d7d4fd35e6e15b47c13c70368da83add19f01e7 (patch)
treed5ee11e647116774edbf2cfc46182acfb3c12700 /drivers/scsi/fcoe
parent15d258674b5c91b9c1ae11264624d5c0d0675e8f (diff)
scsi: fcoe: fix use-after-free in fcoe_ctlr_els_send
KASAN reports a use-after-free in fcoe_ctlr_els_send() when we're sending a LOGO and have FIP debugging enabled. This is because we're first freeing the skb and then printing the frame's DID. But the DID is a member of the FC frame header which in turn is the skb's payload. Exchange the debug print and kfree_skb() calls so we're not touching the freed data. Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/fcoe')
-rw-r--r--drivers/scsi/fcoe/fcoe_ctlr.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/scsi/fcoe/fcoe_ctlr.c b/drivers/scsi/fcoe/fcoe_ctlr.c
index ea23c8dffc25..ceb35ebbeb8f 100644
--- a/drivers/scsi/fcoe/fcoe_ctlr.c
+++ b/drivers/scsi/fcoe/fcoe_ctlr.c
@@ -799,9 +799,9 @@ int fcoe_ctlr_els_send(struct fcoe_ctlr *fip, struct fc_lport *lport,
fip->send(fip, skb);
return -EINPROGRESS;
drop:
- kfree_skb(skb);
LIBFCOE_FIP_DBG(fip, "drop els_send op %u d_id %x\n",
op, ntoh24(fh->fh_d_id));
+ kfree_skb(skb);
return -EINVAL;
}
EXPORT_SYMBOL(fcoe_ctlr_els_send);