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Commit c7b675de authored by Leonidas S. Barbosa's avatar Leonidas S. Barbosa Committed by Herbert Xu
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crypto: nx - Moving NX-AES-ECB to be processed logic 



The previous limits were estimated locally in a single step
basead on bound values, however it was not correct since
when given certain scatterlist the function nx_build_sg_lists
was consuming more sg entries than allocated causing a
memory corruption and crashes.

This patch removes the old logic and replaces it into nx_sg_build_lists
in order to build a correct nx_sg list using the correct sg_max limit
and bounds.

Signed-off-by: default avatarLeonidas S. Barbosa <leosilva@linux.vnet.ibm.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 01a5aa08

drivers/crypto/nx/nx-aes-ecb.c

+2 −10
Original line number Diff line number Diff line
@@ -72,27 +72,19 @@ static int ecb_aes_nx_crypt(struct blkcipher_desc *desc, 
	struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;

	unsigned long irq_flags;

	unsigned int processed = 0, to_process;

	u32 max_sg_len;

	int rc;



	spin_lock_irqsave(&nx_ctx->lock, irq_flags);



	max_sg_len = min_t(u32, nx_driver.of.max_sg_len/sizeof(struct nx_sg),

			   nx_ctx->ap->sglen);



	if (enc)

		NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;

	else

		NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;



	do {

		to_process = min_t(u64, nbytes - processed,

				   nx_ctx->ap->databytelen);

		to_process = min_t(u64, to_process,

				   NX_PAGE_SIZE * (max_sg_len - 1));

		to_process = to_process & ~(AES_BLOCK_SIZE - 1);

		to_process = nbytes - processed;



		rc = nx_build_sg_lists(nx_ctx, desc, dst, src, to_process,

		rc = nx_build_sg_lists(nx_ctx, desc, dst, src, &to_process,

				processed, NULL);

		if (rc)

			goto out;