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| author |   Nicholas Bellinger <nab@linux-iscsi.org> | 2014-06-12 12:45:02 -0700 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2014-06-12 12:45:02 -0700 |
| commit | 0ed6e189e3f6ac3a25383ed5cc8b0ac24c9b97b7 (patch) | |
| tree | 934fe69ad3de329696eb4cdb44126e749fa0f78f /drivers | |
| parent | vhost-scsi: Include prot_bytes into expected data transfer length (diff) | |
| download | linux-dev-0ed6e189e3f6ac3a25383ed5cc8b0ac24c9b97b7.tar.xz linux-dev-0ed6e189e3f6ac3a25383ed5cc8b0ac24c9b97b7.zip | |
target: Fix NULL pointer dereference for XCOPY in target_put_sess_cmd
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>
Diffstat (limited to 'drivers')
| -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 c9e8b35a954f..4ef11145c746 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -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); } |