diff mbox

tcm_loop: use after free on error

Message ID 20160302100941.GE5533@mwanda (mailing list archive)
State Not Applicable, archived
Headers show

Commit Message

Dan Carpenter March 2, 2016, 10:09 a.m. UTC 
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.carpenter@oracle.com>

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Comments

Tomas Henzl March 3, 2016, 1:44 p.m. UTC | #1 
On 2.3.2016 11:09, Dan Carpenter wrote:
> 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.carpenter@oracle.com>

Reviewed-by: Tomas Henzl <thenzl@redhat.com>

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Nicholas A. Bellinger March 5, 2016, 7:21 a.m. UTC | #2 
On Wed, 2016-03-02 at 13:09 +0300, Dan Carpenter wrote:
> 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.carpenter@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;

Also fixed + squashed into HCH's original patch.

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diff mbox

Patch

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;