This is a note to let you know that I've just added the patch titled
target/iscsi: Fix a race condition in iscsit_add_reject_from_cmd()
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
target-iscsi-fix-a-race-condition-in-iscsit_add_reject_from_cmd.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Mon Dec 18 15:03:25 CET 2017
From: Bart Van Assche <bart.vanassche@xxxxxxx>
Date: Tue, 31 Oct 2017 11:03:17 -0700
Subject: target/iscsi: Fix a race condition in iscsit_add_reject_from_cmd()
From: Bart Van Assche <bart.vanassche@xxxxxxx>
[ Upstream commit cfe2b621bb18d86e93271febf8c6e37622da2d14 ]
Avoid that cmd->se_cmd.se_tfo is read after a command has already been
freed.
Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Mike Christie <mchristi@xxxxxxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/target/iscsi/iscsi_target.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -674,6 +674,7 @@ static int iscsit_add_reject_from_cmd(
unsigned char *buf)
{
struct iscsi_conn *conn;
+ const bool do_put = cmd->se_cmd.se_tfo != NULL;
if (!cmd->conn) {
pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
@@ -704,7 +705,7 @@ static int iscsit_add_reject_from_cmd(
* Perform the kref_put now if se_cmd has already been setup by
* scsit_setup_scsi_cmd()
*/
- if (cmd->se_cmd.se_tfo != NULL) {
+ if (do_put) {
pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
target_put_sess_cmd(&cmd->se_cmd);
}
Patches currently in stable-queue which might be from bart.vanassche@xxxxxxx are
queue-3.18/target-iscsi-fix-a-race-condition-in-iscsit_add_reject_from_cmd.patch