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x86/microcode/AMD: Fix __apply_microcode_amd()'s return value

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When verify_sha256_digest() fails, __apply_microcode_amd() should propagate
the failure by returning false (and not -1 which is promoted to true).

Fixes: 50cef76d5cb0 ("x86/microcode/AMD: Load only SHA256-checksummed patches")
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20250327230503.1850368-2-boris.ostrovsky@oracle.com
This commit is contained in:
Boris Ostrovsky 2025-03-27 19:05:02 -04:00 committed by Borislav Petkov (AMD)
parent dc84bc2aba
commit 31ab12df72
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kernel/cpu/microcode/amd.c
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@ -600,7 +600,7 @@ static bool __apply_microcode_amd(struct microcode_amd *mc, u32 *cur_rev,
unsigned long p_addr = (unsigned long)&mc->hdr.data_code; unsigned long p_addr = (unsigned long)&mc->hdr.data_code;
if (!verify_sha256_digest(mc->hdr.patch_id, *cur_rev, (const u8 *)p_addr, psize)) if (!verify_sha256_digest(mc->hdr.patch_id, *cur_rev, (const u8 *)p_addr, psize))
return -1; return false;
native_wrmsrl(MSR_AMD64_PATCH_LOADER, p_addr); native_wrmsrl(MSR_AMD64_PATCH_LOADER, p_addr);