disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/drivers/acpi/acpica/dswstate.c
..
..
@@ -576,9 +576,14 @@
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 	ACPI_FUNCTION_TRACE(ds_init_aml_walk);
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 	walk_state->parser_state.aml =
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-	    walk_state->parser_state.aml_start = aml_start;
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-	walk_state->parser_state.aml_end =
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-	    walk_state->parser_state.pkg_end = aml_start + aml_length;
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+	    walk_state->parser_state.aml_start =
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+	    walk_state->parser_state.aml_end =
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+	    walk_state->parser_state.pkg_end = aml_start;
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+	/* Avoid undefined behavior: applying zero offset to null pointer */
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+	if (aml_length != 0) {
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+		walk_state->parser_state.aml_end += aml_length;
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+		walk_state->parser_state.pkg_end += aml_length;
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+	}
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 	/* The next_op of the next_walk will be the beginning of the method */
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