1 files changed, 7 insertions, 0 deletions

diff --git a/fs/dlm/user.c b/fs/dlm/user.c
index eb4ed9ba3098..7ff49852b0cb 100644
--- a/fs/dlm/user.c
+++ b/fs/dlm/user.c
@@ -503,6 +503,13 @@ static ssize_t device_write(struct file *file, const char __user *buf,
 #endif
                 return -EINVAL;
 
+#ifdef CONFIG_COMPAT
+        if (count > sizeof(struct dlm_write_request32) + DLM_RESNAME_MAXLEN)
+#else
+        if (count > sizeof(struct dlm_write_request) + DLM_RESNAME_MAXLEN)
+#endif
+                return -EINVAL;
+
         kbuf = kzalloc(count + 1, GFP_NOFS);
         if (!kbuf)
                 return -ENOMEM;