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Abstract

Embodiments relates to a data processing device (1) for detecting a read access to unallocated or uninitialized memory, comprising a processor (2), a memory controller (3) and a memory (4), wherein the processor (2) is configured for executing an operating system (OS) and computer programs (P), wherein the operating system (OS) is configured for allocating and releasing memory for said computer programs (P), wherein the memory controller (3) comprises an error correction code determination unit (5), and is configured for:—in response to a write access command for storing first data (D₁) in the memory (4), determining a first error correction code (ECC₁) in function of said first data (D₁) and storing said first error correction code (ECC₁) and said first data (D₁) in association in said memory (4),—in response to a read access command for reading second data (D₂) from the memory, determining (T4) a second error correction code (ECC₂) in function of the second data (D₂), comparing (T5) the second error correction code (ECC₂) with a third error correction code (ECC₃) stored in association with said second data (D₂) in the memory (4), and outputting (T6) the second data (D₂) if the second and third error correction codes match or outputting (T6′) an read error signal if the second and third error correction codes do not match,—in response to a write access command to a test interface of the memory controller (3), storing (U4) a fourth error correction code (ECC₄) in association with third data (D₃) in the memory (4), wherein the fourth error correction code (ECC₄) is invalid with respect to said third data (D3), wherein the processor is configured for outputting (U2) a write access command for a memory area to said test interface of the memory controller (3) in response to releasing (U1) of the memory area by the operating system (OS).

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First Claim