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crypto: picoxcell - Clamp AEAD SG list by input length 

Currently the driver assumes that the SG list contains exactly
the number of bytes required.  This assumption is incorrect.

Up until now this has been harmless.  However with the new AEAD
interface this now breaks as the AD SG list contains more bytes
than just the AD.

This patch fixes this by always clamping the AD SG list by the
specified AD length.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2015-06-11 11:28:34 +08:00
parent 1a5b951f25
commit 81781e6815
1 changed files with 11 additions and 3 deletions
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14
drivers/crypto/picoxcell_crypto.c
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@ -318,6 +318,7 @@ static int spacc_aead_make_ddts(struct spacc_req *req, u8 *giv)
struct spacc_ddt *src_ddt, *dst_ddt;
unsigned ivsize = crypto_aead_ivsize(crypto_aead_reqtfm(areq));
unsigned nents = sg_count(areq->src, areq->cryptlen);
unsigned total;
dma_addr_t iv_addr;
struct scatterlist *cur;
int i, dst_ents, src_ents, assoc_ents;
@ -361,11 +362,18 @@ static int spacc_aead_make_ddts(struct spacc_req *req, u8 *giv)
* Map the associated data. For decryption we don't copy the
* associated data.
*/
total = areq->assoclen;
for_each_sg(areq->assoc, cur, assoc_ents, i) {
ddt_set(src_ddt++, sg_dma_address(cur), sg_dma_len(cur));
unsigned len = sg_dma_len(cur);
if (len > total)
len = total;
total -= len;
ddt_set(src_ddt++, sg_dma_address(cur), len);
if (req->is_encrypt)
ddt_set(dst_ddt++, sg_dma_address(cur),
sg_dma_len(cur));
ddt_set(dst_ddt++, sg_dma_address(cur), len);
}
ddt_set(src_ddt++, iv_addr, ivsize);