dma-buf: Release module reference on creation failure

If we fail to create the anon file, we need to remember to release the
module reference on the owner.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: linux-media@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linaro-mm-sig@lists.linaro.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1468840582-21469-1-git-send-email-chris@chris-wilson.co.uk

1 files changed, 11 insertions, 4 deletions

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 20ce0687b111..ddaee60ae52a 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -334,6 +334,7 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
         struct reservation_object *resv = exp_info->resv;
         struct file *file;
         size_t alloc_size = sizeof(struct dma_buf);
+        int ret;
 
         if (!exp_info->resv)
                 alloc_size += sizeof(struct reservation_object);
@@ -357,8 +358,8 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
 
         dmabuf = kzalloc(alloc_size, GFP_KERNEL);
         if (!dmabuf) {
-                module_put(exp_info->owner);
-                return ERR_PTR(-ENOMEM);
+                ret = -ENOMEM;
+                goto err_module;
         }
 
         dmabuf->priv = exp_info->priv;
@@ -379,8 +380,8 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
         file = anon_inode_getfile("dmabuf", &dma_buf_fops, dmabuf,
                                         exp_info->flags);
         if (IS_ERR(file)) {
-                kfree(dmabuf);
-                return ERR_CAST(file);
+                ret = PTR_ERR(file);
+                goto err_dmabuf;
         }
 
         file->f_mode |= FMODE_LSEEK;
@@ -394,6 +395,12 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
         mutex_unlock(&db_list.lock);
 
         return dmabuf;
+
+err_dmabuf:
+        kfree(dmabuf);
+err_module:
+        module_put(exp_info->owner);
+        return ERR_PTR(ret);
 }
 EXPORT_SYMBOL_GPL(dma_buf_export);