x86/microcode/AMD: Fix container size's type

Make it size_t everywhere as this is what we get from cpio.

 [ bp: Fix a smatch warning. ]

Originally-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20181107170218.7596-13-bp@alien8.de

diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 5775dc9..66490ff 100644 (file)
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -186,8 +186,7 @@ __verify_patch_section(const u8 *buf, size_t buf_size, u32 *sh_psize, bool early
  * exceed the per-family maximum). @sh_psize is the size read from the section
  * header.
  */
-static unsigned int
-__verify_patch_size(u8 family, u32 sh_psize, unsigned int buf_size)
+static unsigned int __verify_patch_size(u8 family, u32 sh_psize, size_t buf_size)
 {
        u32 max_size;
 
@@ -285,10 +284,10 @@ verify_patch(u8 family, const u8 *buf, size_t buf_size, u32 *patch_size, bool ea
  * Returns the amount of bytes consumed while scanning. @desc contains all the
  * data we're going to use in later stages of the application.
  */
-static ssize_t parse_container(u8 *ucode, ssize_t size, struct cont_desc *desc)
+static size_t parse_container(u8 *ucode, size_t size, struct cont_desc *desc)
 {
        struct equiv_cpu_entry *eq;
-       ssize_t orig_size = size;
+       size_t orig_size = size;
        u32 *hdr = (u32 *)ucode;
        u16 eq_id;
        u8 *buf;
@@ -366,15 +365,18 @@ out:
  */
 static void scan_containers(u8 *ucode, size_t size, struct cont_desc *desc)
 {
-       ssize_t rem = size;
-
-       while (rem >= 0) {
-               ssize_t s = parse_container(ucode, rem, desc);
+       while (size) {
+               size_t s = parse_container(ucode, size, desc);
                if (!s)
                        return;
 
-               ucode += s;
-               rem   -= s;
+               /* catch wraparound */
+               if (size >= s) {
+                       ucode += s;
+                       size  -= s;
+               } else {
+                       return;
+               }
        }
 }