diff options
author | Nicholas Bellinger <nab@linux-iscsi.org> | 2014-06-12 12:45:02 -0700 |
---|---|---|
committer | Jiri Slaby <jslaby@suse.cz> | 2014-06-20 17:33:47 +0200 |
commit | 9c7e073545e0a7139d8071b7f012ea885fe69d4f (patch) | |
tree | b64b0ef4aaf074f67a1f10af0e1dbee7255553c9 /drivers/target | |
parent | 6e8451cbf0d2e90d8cabac10b47848e3aaf8aa4e (diff) |
target: Fix NULL pointer dereference for XCOPY in target_put_sess_cmd
commit 0ed6e189e3f6ac3a25383ed5cc8b0ac24c9b97b7 upstream.
This patch fixes a NULL pointer dereference regression bug that was
introduced with:
commit 1e1110c43b1cda9fe77fc4a04835e460550e6b3c
Author: Mikulas Patocka <mpatocka@redhat.com>
Date: Sat May 17 06:49:22 2014 -0400
target: fix memory leak on XCOPY
Now that target_put_sess_cmd() -> kref_put_spinlock_irqsave() is
called with a valid se_cmd->cmd_kref, a NULL pointer dereference
is triggered because the XCOPY passthrough commands don't have
an associated se_session pointer.
To address this bug, go ahead and checking for a NULL se_sess pointer
within target_put_sess_cmd(), and call se_cmd->se_tfo->release_cmd()
to release the XCOPY's xcopy_pt_cmd memory.
Reported-by: Thomas Glanzmann <thomas@glanzmann.de>
Cc: Thomas Glanzmann <thomas@glanzmann.de>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org # 3.12+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'drivers/target')
-rw-r--r-- | drivers/target/target_core_transport.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 179141e03cb3..edacb8d0d6b8 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -2343,6 +2343,10 @@ static void target_release_cmd_kref(struct kref *kref) */ int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd) { + if (!se_sess) { + se_cmd->se_tfo->release_cmd(se_cmd); + return 1; + } return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref, &se_sess->sess_cmd_lock); } |