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btrfs: fix page leaks after failure to lock page for delalloc 

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>
This commit is contained in:
Robbie Ko 2020-07-20 09:42:09 +08:00 committed by David Sterba
parent fa91e4aa17
commit 5909ca110b
1 changed files with 2 additions and 1 deletions
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3
fs/btrfs/extent_io.c
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@ -1999,7 +1999,8 @@ static int __process_pages_contig(struct address_space *mapping,
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;
}