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")
Cc: stable@xxxxxxxxxxxxxxx # 4.8+
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
fs/f2fs/file.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index c786507..0237217 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -967,7 +967,7 @@ static int __clone_blkaddrs(struct inode *src_inode, struct inode *dst_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 {
--
2.8.3
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