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"program_info_length" is user controlled and can go up to 4095. The operand[] array has 509 bytes so we need to add a limit here to prevent buffer overflows. The " - 4" in the limit check is because we have 4 bytes more data to add after the memcpy(). [[email protected]: as I merged the version 1 of the patch, I needed to rebase to apply just the differences between v1 and v2] Signed-off-by: Dan Carpenter <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]>