Syed Mohammed Nayyar
636b173035
The structure length comes from the firmware SMBIOS table and the only bound before the fixed-offset wake_up_type write was an assert(), which is a no-op in release sd-boot builds. Whether the field is present is governed by the formatted-area length header->length, not the total size which also covers the trailing string set. A too-short record (an old SMBIOS 2.0 one, or a crafted 6-byte header) makes the offset-24 write land past the xmemdup() copy; a record with a short formatted area but long string set instead gets a stable string byte zeroed in the copy. Key the guard off header->length and the field offset, matching get_smbios_table(), and measure such records as-is. Zero only the part of the field that lies within the formatted area, and collapse the two measure_smbios_raw() call sites by selecting what to measure via a pointer. Signed-off-by: Syed Mohammed Nayyar <jmestwa@gmail.com>
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