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From: Chen Anqing <chenanqing@oppo.com>
To: Lee Duncan <lduncan@suse.com>
Cc: Chris Leech <cleech@redhat.com>,
"James E . J . Bottomley" <jejb@linux.ibm.com>,
"Martin K . Petersen" <martin.petersen@oracle.com>,
ceph-devel@vger.kernel.org,
open-iscsi@googlegroups.com,
linux-scsi@vger.kernel.org,
linux-kernel@vger.kernel.org,
chenanqing@oppo.com
Subject: [PATCH] scsi: libiscsi: we should take compound page into account also
Date: Fri, 27 Mar 2020 05:20:01 -0400
Message-Id: <20200327092001.56879-1-chenanqing@oppo.com>
X-Mailer: git-send-email 2.18.2

the patch is occur at a real crash,which slab is
come from a compound page,so we need take the compound page
into account also.
fixed commit 08b11eaccfcf ("scsi: libiscsi: fall back to
sendmsg for slab pages").

Signed-off-by: Chen Anqing <chenanqing@oppo.com>
---
drivers/scsi/libiscsi_tcp.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/libiscsi_tcp.c b/drivers/scsi/libiscsi_tcp.c
index 6ef93c7af954..98304e5e1f6f 100644
--- a/drivers/scsi/libiscsi_tcp.c
+++ b/drivers/scsi/libiscsi_tcp.c
@@ -128,7 +128,8 @@ static void iscsi_tcp_segment_map(struct iscsi_segment *segment, int recv)
* coalescing neighboring slab objects into a single frag which
* triggers one of hardened usercopy checks.
*/
- if (!recv && page_count(sg_page(sg)) >= 1 && !PageSlab(sg_page(sg)))
+ if (!recv && page_count(sg_page(sg)) >= 1 &&
+ !PageSlab(compound_head(sg_page(sg))))
return;

if (recv) {
--
2.18.2
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