1 files changed, 5 insertions, 2 deletions

diff --git a/fs/fcntl.c b/fs/fcntl.c
index 5f96786d1c7..dc4a7007f4e 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -208,8 +208,11 @@ static int setfl(int fd, struct file * filp, unsigned long arg)
         struct inode * inode = filp->f_dentry->d_inode;
         int error = 0;
 
-        /* O_APPEND cannot be cleared if the file is marked as append-only */
-        if (!(arg & O_APPEND) && IS_APPEND(inode))
+        /*
+         * O_APPEND cannot be cleared if the file is marked as append-only
+         * and the file is open for write.
+         */
+        if (((arg ^ filp->f_flags) & O_APPEND) && IS_APPEND(inode))
                 return -EPERM;
 
         /* O_NOATIME can only be set by the owner or superuser */