[PATCH] ocxl: Fix potential memory leak on context creation

If we couldn't fully init a context, we were leaking memory.

Fixes: b9721d275cc2 ("ocxl: Allow external drivers to use OpenCAPI contexts")
Signed-off-by: Frederic Barrat <redacted>
---
 drivers/misc/ocxl/context.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/misc/ocxl/context.c b/drivers/misc/ocxl/context.c
index bab9c9364184..ab93156aa83e 100644
--- a/drivers/misc/ocxl/context.c
+++ b/drivers/misc/ocxl/context.c

@@ -22,6 +22,7 @@ int ocxl_context_alloc(struct ocxl_context **context, struct ocxl_afu *afu,
 			afu->pasid_base + afu->pasid_max, GFP_KERNEL);
 	if (pasid < 0) {
 		mutex_unlock(&afu->contexts_lock);
+		kfree(*context);
 		return pasid;
 	}
 	afu->pasid_count++;

-- 
2.21.0

On 18/5/19 12:20 am, Frederic Barrat wrote:

If we couldn't fully init a context, we were leaking memory.

Fixes: b9721d275cc2 ("ocxl: Allow external drivers to use OpenCAPI contexts")
Signed-off-by: Frederic Barrat <redacted>

Acked-by: Andrew Donnellan <redacted>

(defensive programming: set *context = NULL so that if the caller 
ignores the return code we get an obvious crash)

  		return pasid;
  	}
  	afu->pasid_count++;

-- 
Andrew Donnellan              OzLabs, ADL Canberra
ajd@linux.ibm.com             IBM Australia Limited

Le 20/05/2019 à 03:45, Andrew Donnellan a écrit :

On 18/5/19 12:20 am, Frederic Barrat wrote:

quoted

If we couldn't fully init a context, we were leaking memory.

Fixes: b9721d275cc2 ("ocxl: Allow external drivers to use OpenCAPI 
contexts")
Signed-off-by: Frederic Barrat <redacted>

Acked-by: Andrew Donnellan <redacted>

quoted

---
  drivers/misc/ocxl/context.c | 1 +
  1 file changed, 1 insertion(+)

diff --git a/drivers/misc/ocxl/context.c b/drivers/misc/ocxl/context.c
index bab9c9364184..ab93156aa83e 100644
--- a/drivers/misc/ocxl/context.c
+++ b/drivers/misc/ocxl/context.c

@@ -22,6 +22,7 @@ int ocxl_context_alloc(struct ocxl_context 

**context, struct ocxl_afu *afu,
              afu->pasid_base + afu->pasid_max, GFP_KERNEL);
      if (pasid < 0) {
          mutex_unlock(&afu->contexts_lock);
+        kfree(*context);

(defensive programming: set *context = NULL so that if the caller 
ignores the return code we get an obvious crash)

Good point. v2 on its way

quoted

          return pasid;
      }
      afu->pasid_count++;