change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/tools/bpf/bpf_exp.y
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@@ -545,6 +545,16 @@
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 	}
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 }
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+static uint8_t bpf_encode_jt_jf_offset(int off, int i)
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+{
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+	int delta = off - i - 1;
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+
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+	if (delta < 0 || delta > 255)
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+		fprintf(stderr, "warning: insn #%d jumps to insn #%d, "
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+				"which is out of range\n", i, off);
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+	return (uint8_t) delta;
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+}
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+
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 static void bpf_reduce_jt_jumps(void)
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 {
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 	int i;
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@@ -552,7 +562,7 @@
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 	for (i = 0; i < curr_instr; i++) {
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 		if (labels_jt[i]) {
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 			int off = bpf_find_insns_offset(labels_jt[i]);
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-			out[i].jt = (uint8_t) (off - i -1);
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+			out[i].jt = bpf_encode_jt_jf_offset(off, i);
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 		}
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 	}
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 }
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@@ -564,7 +574,7 @@
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 	for (i = 0; i < curr_instr; i++) {
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 		if (labels_jf[i]) {
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 			int off = bpf_find_insns_offset(labels_jf[i]);
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-			out[i].jf = (uint8_t) (off - i - 1);
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+			out[i].jf = bpf_encode_jt_jf_offset(off, i);
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 		}
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 	}
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 }