[no subject]

[chenanqing]

From: Chen Anqing <chenanqing@xxxxxxxx>
To: Lee Duncan <lduncan@xxxxxxxx>
Cc: Chris Leech <cleech@xxxxxxxxxx>,
        "James E . J . Bottomley" <jejb@xxxxxxxxxxxxx>,
        "Martin K . Petersen" <martin.petersen@xxxxxxxxxx>,
        ceph-devel@xxxxxxxxxxxxxxx,
        open-iscsi@xxxxxxxxxxxxxxxx,
        linux-scsi@xxxxxxxxxxxxxxx,
        linux-kernel@xxxxxxxxxxxxxxx,
        chenanqing@xxxxxxxx
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@xxxxxxxx>
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@xxxxxxxx>
---
 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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