x86/microcode/AMD: Make __verify_patch_size() return bool

The result of that function is in essence boolean, so simplify to return the
result of the relevant expression. It also makes it follow the convention used
by __verify_patch_section().

No functional changes.

Signed-off-by: Nikolay Borisov <[email protected]>
Signed-off-by: Borislav Petkov (AMD) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Nikolay Borisov

arch/x86/kernel/cpu/microcode/amd.c

@@ -283,13 +283,13 @@ __verify_patch_section(const u8 *buf, size_t buf_size, u32 *sh_psize)
  * exceed the per-family maximum). @sh_psize is the size read from the section
  * header.
  */
-static unsigned int __verify_patch_size(u32 sh_psize, size_t buf_size)
+static bool __verify_patch_size(u32 sh_psize, size_t buf_size)
 {
 	u8 family = x86_family(bsp_cpuid_1_eax);
 	u32 max_size;
 
 	if (family >= 0x15)
-		return min_t(u32, sh_psize, buf_size);
+		goto ret;
 
 #define F1XH_MPB_MAX_SIZE 2048
 #define F14H_MPB_MAX_SIZE 1824
@@ -303,13 +303,15 @@ static unsigned int __verify_patch_size(u32 sh_psize, size_t buf_size)
 		break;
 	default:
 		WARN(1, "%s: WTF family: 0x%x\n", __func__, family);
-		return 0;
+		return false;
 	}
 
-	if (sh_psize > min_t(u32, buf_size, max_size))
-		return 0;
+	if (sh_psize > max_size)
+		return false;
 
-	return sh_psize;
+ret:
+	/* Working with the whole buffer so < is ok. */
+	return sh_psize <= buf_size;
 }
 
 /*
@@ -324,7 +326,6 @@ static int verify_patch(const u8 *buf, size_t buf_size, u32 *patch_size)
 {
 	u8 family = x86_family(bsp_cpuid_1_eax);
 	struct microcode_header_amd *mc_hdr;
-	unsigned int ret;
 	u32 sh_psize;
 	u16 proc_id;
 	u8 patch_fam;
@@ -348,8 +349,7 @@ static int verify_patch(const u8 *buf, size_t buf_size, u32 *patch_size)
 		return -1;
 	}
 
-	ret = __verify_patch_size(sh_psize, buf_size);
-	if (!ret) {
+	if (!__verify_patch_size(sh_psize, buf_size)) {
 		pr_debug("Per-family patch size mismatch.\n");
 		return -1;
 	}