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Diffstat (limited to 'arch/x86/kernel/xsave.c')
-rw-r--r--arch/x86/kernel/xsave.c12
1 files changed, 2 insertions, 10 deletions
diff --git a/arch/x86/kernel/xsave.c b/arch/x86/kernel/xsave.c
index 37e68fc5e24a..6e73db1b7b4e 100644
--- a/arch/x86/kernel/xsave.c
+++ b/arch/x86/kernel/xsave.c
@@ -91,14 +91,6 @@ int save_i387_xstate(void __user *buf)
return 0;
if (task_thread_info(tsk)->status & TS_USEDFPU) {
- /*
- * Start with clearing the user buffer. This will present a
- * clean context for the bytes not touched by the fxsave/xsave.
- */
- err = __clear_user(buf, sig_xstate_size);
- if (err)
- return err;
-
if (use_xsave())
err = xsave_user(buf);
else
@@ -184,8 +176,8 @@ static int restore_user_xstate(void __user *buf)
* init the state skipped by the user.
*/
mask = pcntxt_mask & ~mask;
-
- xrstor_state(init_xstate_buf, mask);
+ if (unlikely(mask))
+ xrstor_state(init_xstate_buf, mask);
return 0;