From abcea86934d7924502425415276fe9668601acab Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Sat, 17 May 2014 06:49:22 -0400 Subject: target: fix memory leak on XCOPY commit 1e1110c43b1cda9fe77fc4a04835e460550e6b3c upstream. On each processed XCOPY command, two "kmalloc-512" memory objects are leaked. These represent two allocations of struct xcopy_pt_cmd in target_core_xcopy.c. The reason for the memory leak is that the cmd_kref field is not initialized (thus, it is zero because the allocations were done with kzalloc). When we decrement zero kref in target_put_sess_cmd, the result is not zero, thus target_release_cmd_kref is not called. This patch fixes the bug by moving kref initialization from target_get_sess_cmd to transport_init_se_cmd (this function is called from target_core_xcopy.c, so it will correctly initialize cmd_kref). It can be easily verified that all code that calls target_get_sess_cmd also calls transport_init_se_cmd earlier, thus moving kref_init shouldn't introduce any new problems. Signed-off-by: Mikulas Patocka Signed-off-by: Nicholas Bellinger Signed-off-by: Jiri Slaby --- drivers/target/target_core_transport.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/target') diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 0b0009b5d4db..179141e03cb3 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -1103,6 +1103,7 @@ void transport_init_se_cmd( init_completion(&cmd->cmd_wait_comp); init_completion(&cmd->task_stop_comp); spin_lock_init(&cmd->t_state_lock); + kref_init(&cmd->cmd_kref); cmd->transport_state = CMD_T_DEV_ACTIVE; cmd->se_tfo = tfo; @@ -2293,7 +2294,6 @@ int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd, unsigned long flags; int ret = 0; - kref_init(&se_cmd->cmd_kref); /* * Add a second kref if the fabric caller is expecting to handle * fabric acknowledgement that requires two target_put_sess_cmd() -- cgit v1.2.3