[SRU][J][PATCH 1/1] x86/CPU/AMD: Terminate the erratum_1386_microcode array

[Kevin Becker]

From: Sebastian Andrzej Siewior <bigeasy at linutronix.de>

The erratum_1386_microcode array requires an empty entry at the end.
Otherwise x86_match_cpu_with_stepping() will continue iterate the array after
it ended.

Add an empty entry to erratum_1386_microcode to its end.

Fixes: 29ba89f189528 ("x86/CPU/AMD: Improve the erratum 1386 workaround")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy at linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp at alien8.de>
Cc: <stable at kernel.org>
Link: https://lore.kernel.org/r/20241126134722.480975-1-bigeasy@linutronix.de
(backported from commit ff6cdc407f4179748f4673c39b0921503199a0ad 6.13)
[kevinbecker: fixed context conflict due to the backport of the break
 commit (4a3beb84ba8e63042030c13803bb8804d0123675), since Jammy is
 missing 'fix_erratum_1386' definition]
CVE-2024-56721
Signed-off-by: Kevin Becker <kevin.becker at canonical.com>
---
 arch/x86/kernel/cpu/amd.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index d7e96ed427ef..4062cf3cdaeb 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -935,6 +935,7 @@ static void init_amd_bd(struct cpuinfo_x86 *c)
 static const struct x86_cpu_desc erratum_1386_microcode[] = {
 	AMD_CPU_DESC(0x17,  0x1, 0x2, 0x0800126e),
 	AMD_CPU_DESC(0x17, 0x31, 0x0, 0x08301052),
+	{},
 };
 
 void init_spectral_chicken(struct cpuinfo_x86 *c)
-- 
2.43.0