From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47790) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fGTJ2-0004R5-Fx for qemu-devel@nongnu.org; Wed, 09 May 2018 13:55:13 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fGTJ0-0005FG-Td for qemu-devel@nongnu.org; Wed, 09 May 2018 13:55:12 -0400 Received: from mail-pf0-x243.google.com ([2607:f8b0:400e:c00::243]:40594) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1fGTJ0-0005Do-GN for qemu-devel@nongnu.org; Wed, 09 May 2018 13:55:10 -0400 Received: by mail-pf0-x243.google.com with SMTP id f189so25991699pfa.7 for ; Wed, 09 May 2018 10:55:10 -0700 (PDT) From: Richard Henderson Date: Wed, 9 May 2018 10:54:35 -0700 Message-Id: <20180509175458.15642-6-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 05/28] target/unicore32: 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 Cc: Guan Xuetao Signed-off-by: Emilio G. Cota Signed-off-by: Richard Henderson --- target/unicore32/translate.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/target/unicore32/translate.c b/target/unicore32/translate.c index 5b51f2166d..abe2ea8592 100644 --- a/target/unicore32/translate.c +++ b/target/unicore32/translate.c @@ -1875,7 +1875,7 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb) CPUUniCore32State *env = cs->env_ptr; DisasContext dc1, *dc = &dc1; target_ulong pc_start; - uint32_t next_page_start; + uint32_t page_start; int num_insns; int max_insns; @@ -1894,7 +1894,7 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb) cpu_F1s = tcg_temp_new_i32(); cpu_F0d = tcg_temp_new_i64(); cpu_F1d = tcg_temp_new_i64(); - 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) { @@ -1951,7 +1951,7 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb) } while (!dc->is_jmp && !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