lkml.org 
[lkml]   [2018]   [Jul]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/3] fcoe: fix use-after-free in fcoe_ctlr_els_send
Date
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>
---
drivers/scsi/fcoe/fcoe_ctlr.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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);
--
2.16.4
\
 
 \ /
  Last update: 2018-07-31 15:49    [W:0.096 / U:7.108 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site