[Stable-9.0.3 18/69] target/loongarch: Fix helper_lddir() a CID INTEGER_OVERFLOW issue

[Michael Tokarev]

From: Song Gao <gaosong@loongson.cn>

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>
(cherry picked from commit a18ffbcf8b9fabfc6c850ebb1d3e40a21b885c67)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/target/loongarch/tcg/tlb_helper.c 
b/target/loongarch/tcg/tlb_helper.c
index 57f5308632..2262005499 100644
--- a/target/loongarch/tcg/tlb_helper.c
+++ b/target/loongarch/tcg/tlb_helper.c
@@ -524,6 +524,7 @@ 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)) {
-- 
2.39.2