From: menglong8.dong@gmail.com
To: guoren@kernel.org
Cc: dong.menglong@zte.com.cn, linux-csky@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v2] csky: kprobe: fix unreachable code in simulate_blz32
Date: Mon, 11 Jan 2021 19:10:25 -0800 [thread overview]
Message-ID: <20210112031025.5970-1-dong.menglong@zte.com.cn> (raw)
From: Menglong Dong <dong.menglong@zte.com.cn>
The type of 'val' is 'unsigned long' in simulate_blz32, so 'val < 0'
can't be true.
Cast 'val' to 'long' here to determine branch token or not,
as Guo Ren suggested.
Fixes: 33e53ae1ce41 ("csky: Add kprobes supported")
Signed-off-by: Menglong Dong <dong.menglong@zte.com.cn>
---
v2:
- Cast 'val' to 'long'.
---
arch/csky/kernel/probes/simulate-insn.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/csky/kernel/probes/simulate-insn.c b/arch/csky/kernel/probes/simulate-insn.c
index 4e464fed52ec..9ad771c47670 100644
--- a/arch/csky/kernel/probes/simulate-insn.c
+++ b/arch/csky/kernel/probes/simulate-insn.c
@@ -348,7 +348,7 @@ simulate_blz32(u32 opcode, long addr, struct pt_regs *regs)
csky_insn_reg_get_val(regs, tmp, &val);
- if (val < 0) {
+ if ((long)val < 0) {
instruction_pointer_set(regs,
addr + sign_extend32((opcode & 0xffff0000) >> 15, 15));
} else
--
2.17.1
reply other threads:[~2021-01-12 3:11 UTC|newest]
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