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kprobes/x86: Free 'optinsn' cache when range check fails

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This patch frees the 'optinsn' slot when we get a range check error,
to prevent memory leaks.

Before this patch, cache entry in kprobe_insn_cache() won't be freed
if kprobe optimizing fails due to range check failure.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Pei Feiyue <peifeiyue@huawei.com>
Link: http://lkml.kernel.org/r/1406550019-70935-1-git-send-email-wangnan0@huawei.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Wang Nan 2014-07-28 20:20:19 +08:00 committed by Ingo Molnar
parent 68e370289c
commit 256aae5eac
1 changed files with 3 additions and 1 deletions
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4
arch/x86/kernel/kprobes/opt.c
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@ -338,8 +338,10 @@ int arch_prepare_optimized_kprobe(struct optimized_kprobe *op)
* a relative jump.
*/
rel = (long)op->optinsn.insn - (long)op->kp.addr + RELATIVEJUMP_SIZE;
if (abs(rel) > 0x7fffffff)
if (abs(rel) > 0x7fffffff) {
__arch_remove_optimized_kprobe(op, 0);
return -ERANGE;
}
buf = (u8 *)op->optinsn.insn;