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-rw-r--r--src/misc/ptrace.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/misc/ptrace.c b/src/misc/ptrace.c
index f8540698..83b8022b 100644
--- a/src/misc/ptrace.c
+++ b/src/misc/ptrace.c
@@ -17,9 +17,9 @@ long ptrace(int req, ...)
addr2 = va_arg(ap, void *);
va_end(ap);
- if (req<4U) data = &result;
+ if (req-1U < 3) data = &result;
ret = syscall(SYS_ptrace, req, pid, addr, data, addr2);
- if (ret<0 || req>=4U) return ret;
+ if (ret < 0 || req-1U >= 3) return ret;
return result;
}