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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>
This commit is contained in:
Li Zefan 2012-01-09 14:27:42 +08:00
parent db804f23a7
commit a1ee5a4581
1 changed files with 5 additions and 3 deletions
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8
fs/btrfs/free-space-cache.c
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@ -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]);
}
}
}