Commit 136f702f authored by Patrick McHardy's avatar Patrick McHardy Committed by Herbert Xu
Browse files

[HIFN]: Properly handle requests for less than the full scatterlist 


    
The scatterlist may contain more data than the crypto request, causing
an underflow of the remaining byte count while walking the list.
    
Use the minimum of the scatterlist element size and the remaining byte
count specified in the crypto request to avoid this.
    
Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
Acked-by: default avatarEvgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent d069033b

drivers/crypto/hifn_795x.c

+10 −10
Original line number Diff line number Diff line
@@ -1433,7 +1433,7 @@ static int ablkcipher_add(void *daddr, unsigned int *drestp, struct scatterlist 
		return -EINVAL;



	while (size) {

		copy = min(drest, src->length);

		copy = min(drest, min(size, src->length));



		saddr = kmap_atomic(sg_page(src), KM_SOFTIRQ1);

		memcpy(daddr, saddr + src->offset, copy);
@@ -1482,7 +1482,7 @@ static int ablkcipher_walk(struct ablkcipher_request *req, 
		if (!IS_ALIGNED(dst->offset, HIFN_D_DST_DALIGN) ||

		    !IS_ALIGNED(dst->length, HIFN_D_DST_DALIGN) ||

		    offset) {

			unsigned slen = src->length - offset;

			unsigned slen = min(src->length - offset, nbytes);

			unsigned dlen = PAGE_SIZE;



			t = &w->cache[idx];
@@ -1540,7 +1540,7 @@ static int ablkcipher_walk(struct ablkcipher_request *req, 


			kunmap_atomic(daddr, KM_SOFTIRQ0);

		} else {

			nbytes -= src->length;

			nbytes -= min(src->length, nbytes);

			idx++;

		}
@@ -1559,7 +1559,7 @@ static int hifn_setup_session(struct ablkcipher_request *req) 
	struct hifn_context *ctx = crypto_tfm_ctx(req->base.tfm);

	struct hifn_device *dev = ctx->dev;

	struct page *spage, *dpage;

	unsigned long soff, doff, flags;

	unsigned long soff, doff, dlen, flags;

	unsigned int nbytes = req->nbytes, idx = 0, len;

	int err = -EINVAL, sg_num;

	struct scatterlist *src, *dst, *t;
@@ -1571,12 +1571,13 @@ static int hifn_setup_session(struct ablkcipher_request *req) 


	while (nbytes) {

		dst = &req->dst[idx];

		dlen = min(dst->length, nbytes);



		if (!IS_ALIGNED(dst->offset, HIFN_D_DST_DALIGN) ||

		    !IS_ALIGNED(dst->length, HIFN_D_DST_DALIGN))

		    !IS_ALIGNED(dlen, HIFN_D_DST_DALIGN))

			ctx->walk.flags |= ASYNC_FLAGS_MISALIGNED;



		nbytes -= dst->length;

		nbytes -= dlen;

		idx++;

	}
@@ -1631,7 +1632,7 @@ static int hifn_setup_session(struct ablkcipher_request *req) 
		if (err)

			goto err_out;



		nbytes -= len;

		nbytes -= min(len, nbytes);

	}



	dev->active = HIFN_DEFAULT_ACTIVE_NUM;
@@ -1736,8 +1737,7 @@ static int ablkcipher_get(void *saddr, unsigned int *srestp, unsigned int offset 
		return -EINVAL;



	while (size) {



		copy = min(dst->length, srest);

		copy = min(srest, min(dst->length, size));



		daddr = kmap_atomic(sg_page(dst), KM_IRQ0);

		memcpy(daddr + dst->offset + offset, saddr, copy);
@@ -1794,7 +1794,7 @@ static void hifn_process_ready(struct ablkcipher_request *req, int error) 
					sg_page(dst), dst->length, nbytes);



				if (!t->length) {

					nbytes -= dst->length;

					nbytes -= min(dst->length, nbytes);

					idx++;

					continue;

				}

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