Merge drm/drm-next into drm-intel-next-queued

We need a backmerge to get DP_DPCD_REV_14 before we push other
i915 changes to dinq that could break compilation.

Signed-off-by: Rodrigo Vivi <[email protected]>

1 files changed, 15 insertions, 22 deletions

diff --git a/security/keys/dh.c b/security/keys/dh.c
index d1ea9f325f94..b203f7758f97 100644
--- a/security/keys/dh.c
+++ b/security/keys/dh.c
@@ -142,6 +142,8 @@ static void kdf_dealloc(struct kdf_sdesc *sdesc)
  * The src pointer is defined as Z || other info where Z is the shared secret
  * from DH and other info is an arbitrary string (see SP800-56A section
  * 5.8.1.2).
+ *
+ * 'dlen' must be a multiple of the digest size.
  */
 static int kdf_ctr(struct kdf_sdesc *sdesc, const u8 *src, unsigned int slen,
 		   u8 *dst, unsigned int dlen, unsigned int zlen)
@@ -162,8 +164,8 @@ static int kdf_ctr(struct kdf_sdesc *sdesc, const u8 *src, unsigned int slen,
 			goto err;
 
 		if (zlen && h) {
-			u8 tmpbuffer[h];
-			size_t chunk = min_t(size_t, zlen, h);
+			u8 tmpbuffer[32];
+			size_t chunk = min_t(size_t, zlen, sizeof(tmpbuffer));
 			memset(tmpbuffer, 0, chunk);
 
 			do {
@@ -173,7 +175,7 @@ static int kdf_ctr(struct kdf_sdesc *sdesc, const u8 *src, unsigned int slen,
 					goto err;
 
 				zlen -= chunk;
-				chunk = min_t(size_t, zlen, h);
+				chunk = min_t(size_t, zlen, sizeof(tmpbuffer));
 			} while (zlen);
 		}
 
@@ -183,24 +185,13 @@ static int kdf_ctr(struct kdf_sdesc *sdesc, const u8 *src, unsigned int slen,
 				goto err;
 		}
 
-		if (dlen < h) {
-			u8 tmpbuffer[h];
-
-			err = crypto_shash_final(desc, tmpbuffer);
-			if (err)
-				goto err;
-			memcpy(dst, tmpbuffer, dlen);
-			memzero_explicit(tmpbuffer, h);
-			return 0;
-		} else {
-			err = crypto_shash_final(desc, dst);
-			if (err)
-				goto err;
+		err = crypto_shash_final(desc, dst);
+		if (err)
+			goto err;
 
-			dlen -= h;
-			dst += h;
-			counter = cpu_to_be32(be32_to_cpu(counter) + 1);
-		}
+		dlen -= h;
+		dst += h;
+		counter = cpu_to_be32(be32_to_cpu(counter) + 1);
 	}
 
 	return 0;
@@ -216,14 +207,16 @@ static int keyctl_dh_compute_kdf(struct kdf_sdesc *sdesc,
 {
 	uint8_t *outbuf = NULL;
 	int ret;
+	size_t outbuf_len = roundup(buflen,
+				    crypto_shash_digestsize(sdesc->shash.tfm));
 
-	outbuf = kmalloc(buflen, GFP_KERNEL);
+	outbuf = kmalloc(outbuf_len, GFP_KERNEL);
 	if (!outbuf) {
 		ret = -ENOMEM;
 		goto err;
 	}
 
-	ret = kdf_ctr(sdesc, kbuf, kbuflen, outbuf, buflen, lzero);
+	ret = kdf_ctr(sdesc, kbuf, kbuflen, outbuf, outbuf_len, lzero);
 	if (ret)
 		goto err;