From 4302303d3c1f6f40b92791702f74d783a51ae60c Mon Sep 17 00:00:00 2001 From: "Emilio G. Cota" Date: Tue, 10 Apr 2018 10:46:58 -0400 Subject: target/lm32: avoid integer overflow in next_page PC check 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) { -- cgit v1.2.1