[PATCH 2/5] x86/sgx: Use memchr_inv() in sgx_validate_secinfo()

[Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>]

Instead of looping through the array of reserved bytes use memchr_inv()
to check the bytes.

Cc: Sean Christopherson <sean.j.christpherson@intel.com>
Cc: Shay Katz-zamir <shay.katz-zamir@intel.com>
Cc: Serge Ayoun <serge.ayoun@intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 arch/x86/kernel/cpu/sgx/driver/ioctl.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/sgx/driver/ioctl.c b/arch/x86/kernel/cpu/sgx/driver/ioctl.c
index 64d3286f3324..d5f326411df0 100644
--- a/arch/x86/kernel/cpu/sgx/driver/ioctl.c
+++ b/arch/x86/kernel/cpu/sgx/driver/ioctl.c
@@ -414,7 +414,6 @@ static int sgx_validate_secinfo(struct sgx_secinfo *secinfo)
 {
 	u64 page_type = secinfo->flags & SGX_SECINFO_PAGE_TYPE_MASK;
 	u64 perm = secinfo->flags & SGX_SECINFO_PERMISSION_MASK;
-	int i;
 
 	if ((secinfo->flags & SGX_SECINFO_RESERVED_MASK) ||
 	    ((perm & SGX_SECINFO_W) && !(perm & SGX_SECINFO_R)) ||
@@ -422,9 +421,8 @@ static int sgx_validate_secinfo(struct sgx_secinfo *secinfo)
 	     page_type != SGX_SECINFO_REG))
 		return -EINVAL;
 
-	for (i = 0; i < SGX_SECINFO_RESERVED_SIZE; i++)
-		if (secinfo->reserved[i])
-			return -EINVAL;
+	if (memchr_inv(secinfo->reserved, 0, SGX_SECINFO_RESERVED_SIZE))
+		return -EINVAL;
 
 	return 0;
 }
-- 
2.20.1