crypto: nx - Moving NX-AES-CBC 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: Leonidas S. Barbosa <leosilva@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/nx/nx-aes-cbc.c b/drivers/crypto/nx/nx-aes-cbc.c
index cc00b52..a066cc3 100644 (file)
--- a/drivers/crypto/nx/nx-aes-cbc.c
+++ b/drivers/crypto/nx/nx-aes-cbc.c
@@ -72,27 +72,19 @@ static int cbc_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, csbcpb->cpb.aes_cbc.iv);
                if (rc)
                        goto out;