From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47685) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fGTJ0-0004Pn-49 for qemu-devel@nongnu.org; Wed, 09 May 2018 13:55:12 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fGTIx-00059F-Ab for qemu-devel@nongnu.org; Wed, 09 May 2018 13:55:10 -0400 Received: from mail-pg0-x244.google.com ([2607:f8b0:400e:c05::244]:38256) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1fGTIx-00057P-2h for qemu-devel@nongnu.org; Wed, 09 May 2018 13:55:07 -0400 Received: by mail-pg0-x244.google.com with SMTP id n9-v6so23007485pgq.5 for ; Wed, 09 May 2018 10:55:06 -0700 (PDT) From: Richard Henderson Date: Wed, 9 May 2018 10:54:33 -0700 Message-Id: <20180509175458.15642-4-richard.henderson@linaro.org> In-Reply-To: <20180509175458.15642-1-richard.henderson@linaro.org> References: <20180509175458.15642-1-richard.henderson@linaro.org> Subject: [Qemu-devel] [PULL 03/28] target/lm32: avoid integer overflow in next_page PC check List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: David Hildenbrand , Alexander Graf , Stafford Horne , Cornelia Huck , Bastian Koppelmann , "Edgar E. Iglesias" , Paolo Bonzini , Michael Walle , Max Filippov , Richard Henderson , Michael Clark , Eduardo Habkost , Sagar Karandikar , peter.maydell@linaro.org, Aurelien Jarno , Yongbok Kim , qemu-s390x@nongnu.org, Artyom Tarasenko , Palmer Dabbelt , David Gibson , qemu-ppc@nongnu.org, qemu-arm@nongnu.org, Mark Cave-Ayland , Guan Xuetao , Peter Crosthwaite , "Emilio G. Cota" From: "Emilio G. Cota" If the PC is in the last page of the address space, next_page_start overflows to 0. Fix it. Reviewed-by: Richard Henderson Acked-by: Michael Walle Cc: Michael Walle Signed-off-by: Emilio G. Cota Signed-off-by: Richard Henderson --- target/lm32/translate.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/target/lm32/translate.c b/target/lm32/translate.c index 2e1c5e6d01..fdd206a860 100644 --- a/target/lm32/translate.c +++ b/target/lm32/translate.c @@ -1055,7 +1055,7 @@ void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb) LM32CPU *cpu = lm32_env_get_cpu(env); struct DisasContext ctx, *dc = &ctx; uint32_t pc_start; - uint32_t next_page_start; + uint32_t page_start; int num_insns; int max_insns; @@ -1075,7 +1075,7 @@ void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb) pc_start &= ~3; } - next_page_start = (pc_start & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE; + page_start = pc_start & TARGET_PAGE_MASK; num_insns = 0; max_insns = tb_cflags(tb) & CF_COUNT_MASK; if (max_insns == 0) { @@ -1115,7 +1115,7 @@ void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb) && !tcg_op_buf_full() && !cs->singlestep_enabled && !singlestep - && (dc->pc < next_page_start) + && (dc->pc - page_start < TARGET_PAGE_SIZE) && num_insns < max_insns); if (tb_cflags(tb) & CF_LAST_IO) { -- 2.17.0