x86, xsave: Cleanup return codes in check_for_xstate()

The places which call check_for_xstate() only care about zero or
non-zero so this patch doesn't change how the code runs, but it's a
cleanup.  The main reason for this patch is that I'm looking for places
which don't return -EFAULT for copy_from_user() failures.

Signed-off-by: Dan Carpenter <error27@gmail.com>
LKML-Reference: <20100603100746.GU5483@bicker>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>

1 files changed, 7 insertions, 6 deletions

diff --git a/arch/x86/kernel/xsave.c b/arch/x86/kernel/xsave.c
index 37e68fc5e24a..980149867a19 100644
--- a/arch/x86/kernel/xsave.c
+++ b/arch/x86/kernel/xsave.c
@@ -36,15 +36,14 @@ int check_for_xstate(struct i387_fxsave_struct __user *buf,
 
         err = __copy_from_user(fx_sw_user, &buf->sw_reserved[0],
                                sizeof(struct _fpx_sw_bytes));
-
         if (err)
-                return err;
+                return -EFAULT;
 
         /*
          * First Magic check failed.
          */
         if (fx_sw_user->magic1 != FP_XSTATE_MAGIC1)
-                return -1;
+                return -EINVAL;
 
         /*
          * Check for error scenarios.
@@ -52,19 +51,21 @@ int check_for_xstate(struct i387_fxsave_struct __user *buf,
         if (fx_sw_user->xstate_size < min_xstate_size ||
             fx_sw_user->xstate_size > xstate_size ||
             fx_sw_user->xstate_size > fx_sw_user->extended_size)
-                return -1;
+                return -EINVAL;
 
         err = __get_user(magic2, (__u32 *) (((void *)fpstate) +
                                             fx_sw_user->extended_size -
                                             FP_XSTATE_MAGIC2_SIZE));
+        if (err)
+                return err;
         /*
          * Check for the presence of second magic word at the end of memory
          * layout. This detects the case where the user just copied the legacy
          * fpstate layout with out copying the extended state information
          * in the memory layout.
          */
-        if (err || magic2 != FP_XSTATE_MAGIC2)
-                return -1;
+        if (magic2 != FP_XSTATE_MAGIC2)
+                return -EFAULT;
 
         return 0;
 }