[08/23] target/iscsi: Fix double free of a TUR followed by a solicited NOPOUT

Submitted by Andrei Vagin on March 27, 2018, 5:37 p.m.


Message ID 1522172237-6960-9-git-send-email-avagin@openvz.org
State New
Series "target: backport bug fixes from the upstream kernel"
Headers show

Commit Message

Andrei Vagin March 27, 2018, 5:37 p.m.
From: Alexei Potashnik <alexei@purestorage.com>

ML: 9547308bda296b6f69876c840a0291fcfbeddbb8

Make sure all non-READ SCSI commands get targ_xfer_tag initialized
to 0xffffffff, not just WRITEs.

Double-free of a TUR cmd object occurs under the following scenario:

1. TUR received (targ_xfer_tag is uninitialized and left at 0)
2. TUR status sent
3. First unsolicited NOPIN is sent to initiator (gets targ_xfer_tag of 0)
4. NOPOUT for NOPIN (with TTT=0) arrives
 - its ExpStatSN acks TUR status, TUR is queued for removal
 - LIO tries to find NOPIN with TTT=0, but finds the same TUR instead,
   TUR is queued for removal for the 2nd time

(Drop unbalanced conditional bracket usage - nab)

Signed-off-by: Alexei Potashnik <alexei@purestorage.com>
Signed-off-by: Spencer Baugh <sbaugh@catern.com>
Cc: <stable@vger.kernel.org> # v3.1+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Andrei Vagin <avagin@openvz.org>
 drivers/target/iscsi/iscsi_target.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Patch hide | download patch | download mbox

diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 35209f0..ea8573e 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -1117,9 +1117,9 @@  int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 	conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
-	if (hdr->flags & ISCSI_FLAG_CMD_READ) {
+	if (hdr->flags & ISCSI_FLAG_CMD_READ)
 		cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
-	} else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
+	else
 		cmd->targ_xfer_tag = 0xFFFFFFFF;
 	cmd->cmd_sn		= be32_to_cpu(hdr->cmdsn);
 	cmd->exp_stat_sn	= be32_to_cpu(hdr->exp_statsn);