Merge branch 'fix-max-write' of git://git.kernel.org/pub/scm/linux/kernel/git/teiglan...

Pull dlm fix from David Teigland:
 "Thanks to Jana who reported the problem and was able to test this fix
  so quickly."

This fixes an incorrect size check that triggered for CONFIG_COMPAT
whether the code was actually doing compat or not.  The incorrect write
size check broke userland (clvmd) when maximum resource name lengths are
used.

* 'fix-max-write' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm:
  dlm: check the write size from user

diff --git a/fs/dlm/user.c b/fs/dlm/user.c
index 7ff4985..911649a 100644 (file)
--- a/fs/dlm/user.c
+++ b/fs/dlm/user.c
@@ -503,11 +503,11 @@ 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
+       /*
+        * can't compare against COMPAT/dlm_write_request32 because
+        * we don't yet know if is64bit is zero
+        */
        if (count > sizeof(struct dlm_write_request) + DLM_RESNAME_MAXLEN)
-#endif
                return -EINVAL;
 
        kbuf = kzalloc(count + 1, GFP_NOFS);