From a18ffbcf8b9fabfc6c850ebb1d3e40a21b885c67 Mon Sep 17 00:00:00 2001
From: Song Gao <gaosong@loongson.cn>
Date: Wed, 24 Jul 2024 09:58:53 +0800
Subject: [PATCH] target/loongarch: Fix helper_lddir() a CID INTEGER_OVERFLOW
issue
When the lddir level is 4 and the base is a HugePage, we may try to put value 4
into a field in the TLBENTRY that is only 2 bits wide.
Fixes: Coverity CID 1547717
Fixes: 9c70db9a43388 ("target/loongarch: Fix tlb huge page loading issue")
Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240724015853.1317396-1-gaosong@loongson.cn>
---
target/loongarch/tcg/tlb_helper.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/target/loongarch/tcg/tlb_helper.c b/target/loongarch/tcg/tlb_helper.c
index d6331f9b0b..97f38fc391 100644
--- a/target/loongarch/tcg/tlb_helper.c
+++ b/target/loongarch/tcg/tlb_helper.c
@@ -525,6 +525,7 @@ target_ulong helper_lddir(CPULoongArchState *env, target_ulong base,
if (unlikely(level == 4)) {
qemu_log_mask(LOG_GUEST_ERROR,
"Attempted use of level 4 huge page\n");
+ return base;
}
if (FIELD_EX64(base, TLBENTRY, LEVEL)) {