From: Nikolay Borisov <nborisov@suse.com>
To: Kangjie Lu <kjlu@umn.edu>
Cc: pakki001@umn.edu, Chris Mason <clm@fb.com>,
Josef Bacik <josef@toxicpanda.com>,
David Sterba <dsterba@suse.com>,
linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] btrfs: fix a NULL pointer dereference
Date: Thu, 14 Mar 2019 10:16:08 +0200 [thread overview]
Message-ID: <95cfa934-4677-0c7f-781e-6ce35a87f9d6@suse.com> (raw)
In-Reply-To: <20190314081304.469-1-kjlu@umn.edu>
On 14.03.19 г. 10:13 ч., Kangjie Lu wrote:
> btrfs_lookup_block_group may fail and return NULL. The fix uses
> assert to ensure cache is not NULL.
>
> Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
>
> ---
> V2: use assert as suggested by Nikolay Borisov <nborisov@suse.com>
> ---
> fs/btrfs/extent-tree.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
> index 994f0cc41799..80d7c272d282 100644
> --- a/fs/btrfs/extent-tree.c
> +++ b/fs/btrfs/extent-tree.c
> @@ -7303,6 +7303,7 @@ void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
>
> pin = 0;
> cache = btrfs_lookup_block_group(fs_info, buf->start);
> + ASSERT(cache);
>
> if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) {
> pin_down_extent(fs_info, cache, buf->start,
>
next prev parent reply other threads:[~2019-03-14 8:16 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-14 7:50 [PATCH] btrfs: fix a NULL pointer dereference Kangjie Lu
2019-03-14 7:54 ` Nikolay Borisov
2019-03-14 8:02 ` Qu Wenruo
2019-03-14 8:03 ` Nikolay Borisov
2019-03-14 8:13 ` [PATCH v2] " Kangjie Lu
2019-03-14 8:16 ` Nikolay Borisov [this message]
2019-03-14 9:15 ` [PATCH] " Qu Wenruo
2019-03-14 9:18 ` Nikolay Borisov
2019-03-14 15:26 ` Kangjie Lu
2019-03-14 10:23 ` Su Yue
2019-03-14 15:41 ` Josef Bacik
2019-03-14 7:59 ` Qu Wenruo
2019-03-25 16:35 ` David Sterba
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