From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Fri, 15 Jul 2016 11:09:13 +0000 (+0300)
Subject: crypto: nx - off by one bug in nx_of_update_msc()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=71d27af29aa5ef06716a8aab15b3bb5144281dc4;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

crypto: nx - off by one bug in nx_of_update_msc()

commit e514cc0a492a3f39ef71b31590a7ef67537ee04b upstream.

The props->ap[] array is defined like this:

	struct alg_props ap[NX_MAX_FC][NX_MAX_MODE][3];

So we can see that if msc->fc and msc->mode are == to NX_MAX_FC or
NX_MAX_MODE then we're off by one.

Fixes: ae0222b7289d ('powerpc/crypto: nx driver code supporting nx encryption')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/crypto/nx/nx.c b/drivers/crypto/nx/nx.c
index 0794f1cc0018..42f0f229f7f7 100644
--- a/drivers/crypto/nx/nx.c
+++ b/drivers/crypto/nx/nx.c
@@ -392,7 +392,7 @@ static void nx_of_update_msc(struct device   *dev,
 		     ((bytes_so_far + sizeof(struct msc_triplet)) <= lenp) &&
 		     i < msc->triplets;
 		     i++) {
-			if (msc->fc > NX_MAX_FC || msc->mode > NX_MAX_MODE) {
+			if (msc->fc >= NX_MAX_FC || msc->mode >= NX_MAX_MODE) {
 				dev_err(dev, "unknown function code/mode "
 					"combo: %d/%d (ignored)\n", msc->fc,
 					msc->mode);