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Tue, 25 Jul 2023 07:59:06 -0700 (PDT) From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Cc: Mark Cave-Ayland , Artyom Tarasenko , Bastian Koppelmann , qemu-block@nongnu.org, =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Richard Henderson Subject: [PULL 06/10] target/mips/mxu: Avoid overrun in gen_mxu_q8adde() Date: Tue, 25 Jul 2023 16:58:25 +0200 Message-Id: <20230725145829.37782-7-philmd@linaro.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20230725145829.37782-1-philmd@linaro.org> References: <20230725145829.37782-1-philmd@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::12c; envelope-from=philmd@linaro.org; helo=mail-lf1-x12c.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=unavailable 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1690297187010100007 Coverity reports a potential overruns (CID 1517770): Overrunning array "mxu_gpr" of 15 8-byte elements at element index 4294967295 (byte offset 34359738367) using index "XRb - 1U" (which evaluates to 4294967295). Add a gen_extract_mxu_gpr() helper similar to gen_load_mxu_gpr() to safely extract MXU registers. Fixes: eb79951ab6 ("target/mips/mxu: Add Q8ADDE ... insns") Signed-off-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Richard Henderson Message-Id: <20230712060806.82323-4-philmd@linaro.org> --- target/mips/tcg/mxu_translate.c | 26 ++++++++++++++++++-------- 1 file changed, 18 insertions(+), 8 deletions(-) diff --git a/target/mips/tcg/mxu_translate.c b/target/mips/tcg/mxu_translat= e.c index 520747a597..e662acd5df 100644 --- a/target/mips/tcg/mxu_translate.c +++ b/target/mips/tcg/mxu_translate.c @@ -644,6 +644,16 @@ static inline void gen_store_mxu_gpr(TCGv t, unsigned = int reg) } } =20 +static inline void gen_extract_mxu_gpr(TCGv t, unsigned int reg, + unsigned int ofs, unsigned int len) +{ + if (reg =3D=3D 0) { + tcg_gen_movi_tl(t, 0); + } else if (reg <=3D 15) { + tcg_gen_extract_tl(t, mxu_gpr[reg - 1], ofs, len); + } +} + /* MXU control register moves. */ static inline void gen_load_mxu_cr(TCGv t) { @@ -3004,10 +3014,10 @@ static void gen_mxu_q8adde(DisasContext *ctx, bool = accumulate) TCGv t5 =3D tcg_temp_new(); =20 if (XRa !=3D 0) { - tcg_gen_extract_tl(t0, mxu_gpr[XRb - 1], 16, 8); - tcg_gen_extract_tl(t1, mxu_gpr[XRc - 1], 16, 8); - tcg_gen_extract_tl(t2, mxu_gpr[XRb - 1], 24, 8); - tcg_gen_extract_tl(t3, mxu_gpr[XRc - 1], 24, 8); + gen_extract_mxu_gpr(t0, XRb, 16, 8); + gen_extract_mxu_gpr(t1, XRc, 16, 8); + gen_extract_mxu_gpr(t2, XRb, 24, 8); + gen_extract_mxu_gpr(t3, XRc, 24, 8); if (aptn2 & 2) { tcg_gen_sub_tl(t0, t0, t1); tcg_gen_sub_tl(t2, t2, t3); @@ -3027,10 +3037,10 @@ static void gen_mxu_q8adde(DisasContext *ctx, bool = accumulate) tcg_gen_or_tl(t4, t2, t0); } if (XRd !=3D 0) { - tcg_gen_extract_tl(t0, mxu_gpr[XRb - 1], 0, 8); - tcg_gen_extract_tl(t1, mxu_gpr[XRc - 1], 0, 8); - tcg_gen_extract_tl(t2, mxu_gpr[XRb - 1], 8, 8); - tcg_gen_extract_tl(t3, mxu_gpr[XRc - 1], 8, 8); + gen_extract_mxu_gpr(t0, XRb, 0, 8); + gen_extract_mxu_gpr(t1, XRc, 0, 8); + gen_extract_mxu_gpr(t2, XRb, 8, 8); + gen_extract_mxu_gpr(t3, XRc, 8, 8); if (aptn2 & 1) { tcg_gen_sub_tl(t0, t0, t1); tcg_gen_sub_tl(t2, t2, t3); --=20 2.38.1