Re: [Qemu-devel] [PATCH for-2.8] gluster: Fix use after free in glfs_clear_preopened()

[Jeff Cody]

On Thu, Nov 17, 2016 at 11:30:08AM +0100, Kevin Wolf wrote:
> This fixes a use-after-free bug introduced in commit 6349c154. We need
> to use QLIST_FOREACH_SAFE() when freeing elements in the loop. Spotted
> by Coverity.
> 
> Signed-off-by: Kevin Wolf <address@hidden>
> ---
>  block/gluster.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/block/gluster.c b/block/gluster.c
> index 0ce15f7..891c13b 100644
> --- a/block/gluster.c
> +++ b/block/gluster.c
> @@ -239,12 +239,13 @@ static glfs_t *glfs_find_preopened(const char *volume)
>  static void glfs_clear_preopened(glfs_t *fs)
>  {
>      ListElement *entry = NULL;
> +    ListElement *next;
>  
>      if (fs == NULL) {
>          return;
>      }
>  
> -    QLIST_FOREACH(entry, &glfs_list, list) {
> +    QLIST_FOREACH_SAFE(entry, &glfs_list, list, next) {
>          if (entry->saved.fs == fs) {
>              if (--entry->saved.ref) {
>                  return;
> -- 
> 1.8.3.1
> 

Thanks,

Applied to my block branch:

git://github.com/codyprime/qemu-kvm-jtc.git block

-Jeff