1 files changed, 12 insertions, 3 deletions

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 6ff9981f0a18..5be436ea088e 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -329,10 +329,19 @@ static int proc_sys_setattr(struct dentry *dentry, struct iattr *attr)
                 return -EPERM;
 
         error = inode_change_ok(inode, attr);
-        if (!error)
-                error = inode_setattr(inode, attr);
+        if (error)
+                return error;
+
+        if ((attr->ia_valid & ATTR_SIZE) &&
+            attr->ia_size != i_size_read(inode)) {
+                error = vmtruncate(inode, attr->ia_size);
+                if (error)
+                        return error;
+        }
 
-        return error;
+        setattr_copy(inode, attr);
+        mark_inode_dirty(inode);
+        return 0;
 }
 
 static int proc_sys_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)