linux-kernel - Re: AMD microcode loading broken on 32 bit

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Message-ID: <20140128162431.GH815@pd.tnic>
Date:	Tue, 28 Jan 2014 17:24:31 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: AMD microcode loading broken on 32 bit

On Thu, Jan 23, 2014 at 02:41:59PM -0500, Boris Ostrovsky wrote:
> 32-bit only.

Ok, I think I know what happens. Can you try this one (I missed doing
this on 32-bit and 64-bit does it, which would explain why it didn't
explode there):

---
diff --git a/arch/x86/kernel/cpu/microcode/amd_early.c b/arch/x86/kernel/cpu/microcode/amd_early.c
index 8384c0fa206f..03b759401bc1 100644
--- a/arch/x86/kernel/cpu/microcode/amd_early.c
+++ b/arch/x86/kernel/cpu/microcode/amd_early.c
@@ -359,7 +359,7 @@ int __init save_microcode_in_initrd_amd(void)
 		pr_info("microcode: updated early to new patch_level=0x%08x\n",
 			ucode_new_rev);
 
-	if (!container)
+	if (!container || !ucode_cpio.data)
 		return -EINVAL;
 
 	eax   = cpuid_eax(0x00000001);

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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