[PATCH] x86/microcode/intel: Out of bounds memory read when reading extended header.

[Quentin Casasnovas <quentin.casasnovas@oracle.com>]

Improper pointer arithmetics when calculating the address of the extended
header could lead to an out of bounds memory read and kernel panic.

Signed-off-by: Quentin Casasnovas <quentin.casasnovas@oracle.com>
---
 arch/x86/kernel/cpu/microcode/intel_early.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git arch/x86/kernel/cpu/microcode/intel_early.c arch/x86/kernel/cpu/microcode/intel_early.c
index 420eb93..3a6c613 100644
--- arch/x86/kernel/cpu/microcode/intel_early.c
+++ arch/x86/kernel/cpu/microcode/intel_early.c
@@ -180,8 +180,7 @@ matching_model_microcode(struct microcode_header_intel *mc_header,
 	if (total_size <= data_size + MC_HEADER_SIZE)
 		return UCODE_NFOUND;
 
-	ext_header = (struct extended_sigtable *)
-		     mc_header + data_size + MC_HEADER_SIZE;
+	ext_header = (void *) mc_header + data_size + MC_HEADER_SIZE;
 	ext_sigcount = ext_header->count;
 	ext_sig = (void *)ext_header + EXT_HEADER_SIZE;
 
@@ -457,8 +456,7 @@ static void __ref show_saved_mc(void)
 		if (total_size <= data_size + MC_HEADER_SIZE)
 			continue;
 
-		ext_header = (struct extended_sigtable *)
-			     mc_saved_header + data_size + MC_HEADER_SIZE;
+		ext_header = (void *) mc_saved_header + data_size + MC_HEADER_SIZE;
 		ext_sigcount = ext_header->count;
 		ext_sig = (void *)ext_header + EXT_HEADER_SIZE;
 
-- 
2.0.5