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Giovanni Cabiddu
b3ac787565
The generic RSA key parser (rsa_helper.c) bounds each CRT component (p,
q, dp, dq, qinv) by the modulus size n_sz, but qat_rsa_setkey_crt()
allocates half-size DMA buffers (key_sz / 2) and right-aligns each
component with:
memcpy(dst + half_key_sz - len, src, len)
When a CRT component is larger than half_key_sz the subtraction
underflows and memcpy writes past the DMA buffer, causing memory
corruption.
Add a len > half_key_sz check next to the existing !len check for each
of the five CRT components so the driver falls back to the non-CRT path
instead of writing out of bounds.
Fixes: 879f77e907 ("crypto: qat - Add RSA CRT mode")
Cc: [email protected]
Signed-off-by: Giovanni Cabiddu <[email protected]>
Reviewed-by: Ahsan Atta <[email protected]>
Reviewed-by: Laurent M Coquerel <[email protected]>
Tested-by: Laurent M Coquerel <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>