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authorBorislav Petkov <bp@suse.de>2016-12-18 17:44:12 +0100
committerThomas Gleixner <tglx@linutronix.de>2016-12-19 10:46:20 +0100
commit200d3553163f6065a0f1f142f92d1cf716d586c2 (patch)
tree4c3d9ab659b36059f8c9c8d65c148e0d406028e8 /arch
parent8feaa64a9a69652fdff87205f8a8cfe1bfd5b522 (diff)
x86/microcode/AMD: Sanitize apply_microcode_early_amd()
Make it simply return bool to denote whether it found a container or not and return the pointer to the container and its size in the handed-in container pointer instead, as returning a struct was just silly. Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Jürgen Gross <jgross@suse.com> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Link: http://lkml.kernel.org/r/20161218164414.9649-3-bp@alien8.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/cpu/microcode/amd.c30
1 files changed, 17 insertions, 13 deletions
diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 31f4e3f94d46..dc80acfa922d 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -216,17 +216,18 @@ static int __apply_microcode_amd(struct microcode_amd *mc_amd)
* and on 32-bit during save_microcode_in_initrd_amd() -- we can call
* load_microcode_amd() to save equivalent cpu table and microcode patches in
* kernel heap memory.
+ *
+ * Returns true if container found (sets @ret_cont), false otherwise.
*/
-static struct container
-apply_microcode_early_amd(void *ucode, size_t size, bool save_patch)
+static bool apply_microcode_early_amd(void *ucode, size_t size, bool save_patch,
+ struct container *ret_cont)
{
- struct container ret = { NULL, 0 };
u8 (*patch)[PATCH_MAX_SIZE];
+ u32 rev, *header, *new_rev;
+ struct container ret;
int offset, left;
- u32 rev, *header;
- u8 *data;
u16 eq_id = 0;
- u32 *new_rev;
+ u8 *data;
#ifdef CONFIG_X86_32
new_rev = (u32 *)__pa_nodebug(&ucode_new_rev);
@@ -237,11 +238,11 @@ apply_microcode_early_amd(void *ucode, size_t size, bool save_patch)
#endif
if (check_current_patch_level(&rev, true))
- return (struct container){ NULL, 0 };
+ return false;
eq_id = find_proper_container(ucode, size, &ret);
if (!eq_id)
- return (struct container){ NULL, 0 };
+ return false;
this_equiv_id = eq_id;
header = (u32 *)ret.data;
@@ -275,7 +276,11 @@ apply_microcode_early_amd(void *ucode, size_t size, bool save_patch)
data += offset;
left -= offset;
}
- return ret;
+
+ if (ret_cont)
+ *ret_cont = ret;
+
+ return true;
}
static bool get_builtin_microcode(struct cpio_data *cp, unsigned int family)
@@ -319,7 +324,7 @@ void __init load_ucode_amd_bsp(unsigned int family)
/* Get BSP's CPUID.EAX(1), needed in load_microcode_amd() */
uci->cpu_sig.sig = cpuid_eax(1);
- apply_microcode_early_amd(cp.data, cp.size, true);
+ apply_microcode_early_amd(cp.data, cp.size, true, NULL);
}
#ifdef CONFIG_X86_32
@@ -351,7 +356,7 @@ void load_ucode_amd_ap(unsigned int family)
* This would set amd_ucode_patch above so that the following APs can
* use it directly instead of going down this path again.
*/
- apply_microcode_early_amd(cp.data, cp.size, true);
+ apply_microcode_early_amd(cp.data, cp.size, true, NULL);
}
#else
void load_ucode_amd_ap(unsigned int family)
@@ -389,8 +394,7 @@ reget:
}
}
- cont = apply_microcode_early_amd(cp.data, cp.size, false);
- if (!(cont.data && cont.size)) {
+ if (!apply_microcode_early_amd(cp.data, cp.size, false, &cont)) {
cont.size = -1;
return;
}