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| author | Bart Van Assche <bart.vanassche@wdc.com> | 2017-10-31 21:03:17 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-12-20 12:10:25 +0300 |
| commit | 68d702c6689d83000060118f940e0adce88e42aa (patch) | |
| tree | 9902049304e16e449898ed239664dc72bd92c1e2 | |
| parent | 96d275b841efc6decf61afafc1703f0e9b92253d (diff) | |
| download | linux-68d702c6689d83000060118f940e0adce88e42aa.tar.xz | |
target/iscsi: Fix a race condition in iscsit_add_reject_from_cmd()
[ 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@wdc.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Mike Christie <mchristi@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/target/iscsi/iscsi_target.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c index d9ba4ee2c62b..52fa52c20be0 100644 --- a/drivers/target/iscsi/iscsi_target.c +++ b/drivers/target/iscsi/iscsi_target.c @@ -834,6 +834,7 @@ 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", @@ -864,7 +865,7 @@ 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); } |