diff mbox

UBI: fix some use after free bugs

Message ID 20140129131756.GC10678@elgon.mountain
State Accepted
Commit 5547fec74a566e1f5e00a937b9a367f7c6a94a8b
Headers show

Commit Message

Dan Carpenter Jan. 29, 2014, 1:17 p.m. UTC
Move the kmem_cache_free() calls down a couple lines.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

Comments

Richard Weinberger Jan. 29, 2014, 1:29 p.m. UTC | #1
Am 29.01.2014 14:17, schrieb Dan Carpenter:
> Move the kmem_cache_free() calls down a couple lines.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

Thanks for fixing this Dan!

Acked-by: Richard Weinberger <richard@nod.at>

> diff --git a/drivers/mtd/ubi/fastmap.c b/drivers/mtd/ubi/fastmap.c
> index ead861307b3c..c5dad652614d 100644
> --- a/drivers/mtd/ubi/fastmap.c
> +++ b/drivers/mtd/ubi/fastmap.c
> @@ -463,8 +463,8 @@ static int scan_pool(struct ubi_device *ubi, struct ubi_attach_info *ai,
>  				}
>  			}
>  			if (found_orphan) {
> -				kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
>  				list_del(&tmp_aeb->u.list);
> +				kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
>  			}
>  
>  			new_aeb = kmem_cache_alloc(ai->aeb_slab_cache,
> @@ -846,16 +846,16 @@ fail_bad:
>  	ret = UBI_BAD_FASTMAP;
>  fail:
>  	list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list) {
> -		kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
>  		list_del(&tmp_aeb->u.list);
> +		kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
>  	}
>  	list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &eba_orphans, u.list) {
> -		kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
>  		list_del(&tmp_aeb->u.list);
> +		kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
>  	}
>  	list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list) {
> -		kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
>  		list_del(&tmp_aeb->u.list);
> +		kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
>  	}
>  
>  	return ret;
>
Artem Bityutskiy Feb. 4, 2014, 7:45 a.m. UTC | #2
On Wed, 2014-01-29 at 16:17 +0300, Dan Carpenter wrote:
> Move the kmem_cache_free() calls down a couple lines.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

Pushed to linux-ubifs.git, thanks!

I'll send this to Linus for 3.13 inclusion.
diff mbox

Patch

diff --git a/drivers/mtd/ubi/fastmap.c b/drivers/mtd/ubi/fastmap.c
index ead861307b3c..c5dad652614d 100644
--- a/drivers/mtd/ubi/fastmap.c
+++ b/drivers/mtd/ubi/fastmap.c
@@ -463,8 +463,8 @@  static int scan_pool(struct ubi_device *ubi, struct ubi_attach_info *ai,
 				}
 			}
 			if (found_orphan) {
-				kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
 				list_del(&tmp_aeb->u.list);
+				kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
 			}
 
 			new_aeb = kmem_cache_alloc(ai->aeb_slab_cache,
@@ -846,16 +846,16 @@  fail_bad:
 	ret = UBI_BAD_FASTMAP;
 fail:
 	list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list) {
-		kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
 		list_del(&tmp_aeb->u.list);
+		kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
 	}
 	list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &eba_orphans, u.list) {
-		kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
 		list_del(&tmp_aeb->u.list);
+		kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
 	}
 	list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list) {
-		kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
 		list_del(&tmp_aeb->u.list);
+		kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
 	}
 
 	return ret;