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-rw-r--r--fs/open.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/open.c b/fs/open.c
index 949cef29c3bb..993a91d20cc7 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -193,7 +193,8 @@ static long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
goto out_putf;
error = -EPERM;
- if (IS_APPEND(inode))
+ /* Check IS_APPEND on real upper inode */
+ if (IS_APPEND(file_inode(f.file)))
goto out_putf;
sb_start_write(inode->i_sb);