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Tue, 11 Jul 2023 23:08:20 -0700 (PDT) Received: from m1x-phil.lan ([176.187.194.156]) by smtp.gmail.com with ESMTPSA id dc21-20020a170906c7d500b00988b86d6c7csm2041132ejb.132.2023.07.11.23.08.18 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 11 Jul 2023 23:08:19 -0700 (PDT) From: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Cc: Aurelien Jarno , Aleksandar Rikalo , Jiaxun Yang , Siarhei Volkau , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Craig Janeczek Subject: [PATCH-for-8.1 2/3] target/mips/mxu: Avoid overrun in gen_mxu_S32SLT() Date: Wed, 12 Jul 2023 08:08:05 +0200 Message-Id: <20230712060806.82323-3-philmd@linaro.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20230712060806.82323-1-philmd@linaro.org> References: <20230712060806.82323-1-philmd@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::62a; envelope-from=philmd@linaro.org; helo=mail-ej1-x62a.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Coverity reports a potential overrun (CID 1517769): Overrunning array "mxu_gpr" of 15 8-byte elements at element index 4294967295 (byte offset 34359738367) using index "XRb - 1U" (which evaluates to 4294967295). Use gen_load_mxu_gpr() to safely load MXU registers. Fixes: ff7936f009 ("target/mips/mxu: Add S32SLT ... insns") Signed-off-by: Philippe Mathieu-Daudé --- target/mips/tcg/mxu_translate.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/target/mips/tcg/mxu_translate.c b/target/mips/tcg/mxu_translate.c index b007948a73..520747a597 100644 --- a/target/mips/tcg/mxu_translate.c +++ b/target/mips/tcg/mxu_translate.c @@ -2434,8 +2434,12 @@ static void gen_mxu_S32SLT(DisasContext *ctx) tcg_gen_movi_tl(mxu_gpr[XRa - 1], 0); } else { /* the most general case */ - tcg_gen_setcond_tl(TCG_COND_LT, mxu_gpr[XRa - 1], - mxu_gpr[XRb - 1], mxu_gpr[XRc - 1]); + TCGv t0 = tcg_temp_new(); + TCGv t1 = tcg_temp_new(); + + gen_load_mxu_gpr(t0, XRb); + gen_load_mxu_gpr(t1, XRc); + tcg_gen_setcond_tl(TCG_COND_LT, mxu_gpr[XRa - 1], t0, t1); } }