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target: Fix NULL pointer dereference for XCOPY in target_put_sess_cmd

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This patch fixes a NULL pointer dereference regression bug that was
introduced with:

commit 1e1110c43b
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>
This commit is contained in:
Nicholas Bellinger 2014-06-12 12:45:02 -07:00
parent 9f977ef7b6
commit 0ed6e189e3
1 changed files with 4 additions and 0 deletions
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4
drivers/target/target_core_transport.c
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@ -2424,6 +2424,10 @@ 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);
}