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crypto: atmel-sha - fix sg list management 

Having a zero length sg doesn't mean it is the end of the sg list. This
case happens when calculating HMAC of IPSec packet.

Signed-off-by: Leilei Zhao <leilei.zhao@atmel.com>
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Leilei Zhao 2015-04-07 17:45:05 +08:00 committed by Herbert Xu
parent 0099286b66
commit 803eeae8f3
1 changed files with 14 additions and 2 deletions
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16
drivers/crypto/atmel-sha.c
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@ -163,8 +163,20 @@ static size_t atmel_sha_append_sg(struct atmel_sha_reqctx *ctx)
count = min(ctx->sg->length - ctx->offset, ctx->total);
count = min(count, ctx->buflen - ctx->bufcnt);
if (count <= 0)
break;
if (count <= 0) {
/*
* Check if count <= 0 because the buffer is full or
* because the sg length is 0. In the latest case,
* check if there is another sg in the list, a 0 length
* sg doesn't necessarily mean the end of the sg list.
*/
if ((ctx->sg->length == 0) && !sg_is_last(ctx->sg)) {
ctx->sg = sg_next(ctx->sg);
continue;
} else {
break;
}
}
scatterwalk_map_and_copy(ctx->buffer + ctx->bufcnt, ctx->sg,
ctx->offset, count, 0);