Is this a patch you might consider? Thanks ...Juerg
On 10/04/2017 10:24 AM, Juerg Haefliger wrote:
> alloc_metapage can return a NULL pointer so check for that. And also emit
> an error message if that happens.
>
> Signed-off-by: Juerg Haefliger <juerg.haefli...@canonical.com>
> ---
> fs/jfs/jfs_metapage.c | 20 +++++++++++++-------
> 1 file changed, 13 insertions(+), 7 deletions(-)
>
> diff --git a/fs/jfs/jfs_metapage.c b/fs/jfs/jfs_metapage.c
> index 1c4b9ad4d7ab..00f21af66872 100644
> --- a/fs/jfs/jfs_metapage.c
> +++ b/fs/jfs/jfs_metapage.c
> @@ -187,14 +187,18 @@ static inline struct metapage *alloc_metapage(gfp_t
> gfp_mask)
> {
> struct metapage *mp = mempool_alloc(metapage_mempool, gfp_mask);
>
> - if (mp) {
> - mp->lid = 0;
> - mp->lsn = 0;
> - mp->data = NULL;
> - mp->clsn = 0;
> - mp->log = NULL;
> - init_waitqueue_head(&mp->wait);
> + if (!mp) {
> + jfs_err("mempool_alloc failed!\n");
> + return NULL;
> }
> +
> + mp->lid = 0;
> + mp->lsn = 0;
> + mp->data = NULL;
> + mp->clsn = 0;
> + mp->log = NULL;
> + init_waitqueue_head(&mp->wait);
> +
> return mp;
> }
>
> @@ -663,6 +667,8 @@ struct metapage *__get_metapage(struct inode *inode,
> unsigned long lblock,
> } else {
> INCREMENT(mpStat.pagealloc);
> mp = alloc_metapage(GFP_NOFS);
> + if (!mp)
> + goto unlock;
> mp->page = page;
> mp->sb = inode->i_sb;
> mp->flag = 0;
>
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