From b908bd3d4c4110a8a2ed84e2b6ab56fa7201db25 Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Fri, 22 Apr 2016 12:56:31 +0300
Subject: [PATCH] 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: d293b640ebd5 ('crypto: mxc-scc - add basic driver for the MXC SCC')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---
drivers/crypto/mxc-scc.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/drivers/crypto/mxc-scc.c b/drivers/crypto/mxc-scc.c
index 38b01bf141d3..9b348a78dd23 100644
--- a/drivers/crypto/mxc-scc.c
+++ b/drivers/crypto/mxc-scc.c
@@ -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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