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| author | Li Zefan <lizf@cn.fujitsu.com> | 2012-01-09 07:27:42 +0100 |
|---|---|---|
| committer | Li Zefan <lizf@cn.fujitsu.com> | 2012-01-11 03:26:34 +0100 |
| commit | a1ee5a45818acc7f9c13e560827cf3e8735ac919 (patch) | |
| tree | 984505e8c99a6965453819651ff0ea91a4ca8d4b /fs/btrfs/free-space-cache.c | |
| parent | Btrfs: add pinned extents to on-disk free space cache correctly (diff) | |
| download | linux-a1ee5a45818acc7f9c13e560827cf3e8735ac919.tar.xz linux-a1ee5a45818acc7f9c13e560827cf3e8735ac919.zip | |
Btrfs: avoid possible NULL deref in io_ctl_drop_pages()
If we run into some failure path in io_ctl_prepare_pages(),
io_ctl->pages[] array may have some NULL pointers.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Diffstat (limited to 'fs/btrfs/free-space-cache.c')
| -rw-r--r-- | fs/btrfs/free-space-cache.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index 01840ef95a32..4e55af333e19 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -319,9 +319,11 @@ static void io_ctl_drop_pages(struct io_ctl *io_ctl) io_ctl_unmap_page(io_ctl); for (i = 0; i < io_ctl->num_pages; i++) { - ClearPageChecked(io_ctl->pages[i]); - unlock_page(io_ctl->pages[i]); - page_cache_release(io_ctl->pages[i]); + if (io_ctl->pages[i]) { + ClearPageChecked(io_ctl->pages[i]); + unlock_page(io_ctl->pages[i]); + page_cache_release(io_ctl->pages[i]); + } } } |