4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jaegeuk Kim <jaeg...@kernel.org>
commit e87f7329bbd6760c2acc4f1eb423362b08851a71 upstream.
In the last ilen case, i was already increased, resulting in accessing out-
of-boundary entry of do_replace and blkaddr.
Fix to check ilen first to exit the loop.
Fixes: 2aa8fbb9693020 ("f2fs: refactor __exchange_data_block for speed up")
Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
fs/f2fs/file.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -970,7 +970,7 @@ static int __clone_blkaddrs(struct inode
new_size = (dst + i) << PAGE_SHIFT;
if (dst_inode->i_size < new_size)
f2fs_i_size_write(dst_inode, new_size);
- } while ((do_replace[i] || blkaddr[i] == NULL_ADDR) &&
--ilen);
+ } while (--ilen && (do_replace[i] || blkaddr[i] ==
NULL_ADDR));
f2fs_put_dnode(&dn);
} else {
