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Commit a1ee5a45 authored by Li Zefan's avatar Li Zefan
Browse files

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: default avatarLi Zefan <lizf@cn.fujitsu.com>
parent db804f23

fs/btrfs/free-space-cache.c

+5 −3
Original line number Diff line number Diff line
@@ -319,11 +319,13 @@ 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++) {

		if (io_ctl->pages[i]) {

			ClearPageChecked(io_ctl->pages[i]);

			unlock_page(io_ctl->pages[i]);

			page_cache_release(io_ctl->pages[i]);

		}

	}

}



static int io_ctl_prepare_pages(struct io_ctl *io_ctl, struct inode *inode,

				int uptodate)