From: Robbie Ko robbieko@synology.com
commit 5909ca110b29aa16b23b52b8de8d3bb1035fd738 upstream.
When locking pages for delalloc, we check if it's dirty and mapping still matches. If it does not match, we need to return -EAGAIN and release all pages. Only the current page was put though, iterate over all the remaining pages too.
CC: stable@vger.kernel.org # 4.14+ Reviewed-by: Filipe Manana fdmanana@suse.com Reviewed-by: Nikolay Borisov nborisov@suse.com Signed-off-by: Robbie Ko robbieko@synology.com Reviewed-by: David Sterba dsterba@suse.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/btrfs/extent_io.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -1923,7 +1923,8 @@ static int __process_pages_contig(struct if (!PageDirty(pages[i]) || pages[i]->mapping != mapping) { unlock_page(pages[i]); - put_page(pages[i]); + for (; i < ret; i++) + put_page(pages[i]); err = -EAGAIN; goto out; }