Commit b908bd3d authored by Dan Carpenter's avatar Dan Carpenter Committed by Herbert Xu

crypto: mxc-scc - signedness bugs in mxc_scc_ablkcipher_req_init()

->src_nents and ->dst_nents are unsigned so they can't be less than
zero.  I fixed this by introducing a temporary "nents" variable.

Fixes: d293b640 ('crypto: mxc-scc - add basic driver for the MXC SCC')
Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 3639ca84
......@@ -210,18 +210,21 @@ static int mxc_scc_ablkcipher_req_init(struct ablkcipher_request *req,
struct mxc_scc_ctx *ctx)
{
struct mxc_scc *scc = ctx->scc;
int nents;
ctx->src_nents = sg_nents_for_len(req->src, req->nbytes);
if (ctx->src_nents < 0) {
nents = sg_nents_for_len(req->src, req->nbytes);
if (nents < 0) {
dev_err(scc->dev, "Invalid number of src SC");
return ctx->src_nents;
return nents;
}
ctx->src_nents = nents;
ctx->dst_nents = sg_nents_for_len(req->dst, req->nbytes);
if (ctx->dst_nents < 0) {
nents = sg_nents_for_len(req->dst, req->nbytes);
if (nents < 0) {
dev_err(scc->dev, "Invalid number of dst SC");
return ctx->dst_nents;
return nents;
}
ctx->dst_nents = nents;
ctx->size = 0;
ctx->offset = 0;
......
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