[patch] tcm_loop: use after free on error

[Dan Carpenter]

We dereference "tl_nexus" to get the error code.

Fixes: 1b418a8fcbc0 ('target: Convert demo-mode only drivers to 
target_alloc_session')
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/target/loopback/tcm_loop.c 
b/drivers/target/loopback/tcm_loop.c
index 0216c75..e0ffb03 100644
--- a/drivers/target/loopback/tcm_loop.c
+++ b/drivers/target/loopback/tcm_loop.c
@@ -808,6 +808,7 @@ static int tcm_loop_make_nexus(
 {
        struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
        struct tcm_loop_nexus *tl_nexus;
+       int ret;
 
        if (tl_tpg->tl_nexus) {
                pr_debug("tl_tpg->tl_nexus already exists\n");
@@ -824,8 +825,9 @@ static int tcm_loop_make_nexus(
                                        TARGET_PROT_DIN_PASS | 
TARGET_PROT_DOUT_PASS,
                                        name, tl_nexus, NULL);
        if (IS_ERR(tl_nexus->se_sess)) {
+               ret = PTR_ERR(tl_nexus->se_sess);
                kfree(tl_nexus);
-               return PTR_ERR(tl_nexus->se_sess);
+               return ret;
        }
 
        tl_tpg->tl_nexus = tl_nexus;