From 5c6ac1d4f8fbdbed65dbeb8cf149d736409d16a1 Mon Sep 17 00:00:00 2001
From: Robert Baronescu <robert.baronescu@nxp.com>
Date: Tue, 10 Oct 2017 13:21:59 +0300
Subject: [PATCH] crypto: tcrypt - fix S/G table for test_aead_speed()
Git-commit: 5c6ac1d4f8fbdbed65dbeb8cf149d736409d16a1
Patch-mainline: v4.16-rc1
References: bsc#1051510

In case buffer length is a multiple of PAGE_SIZE,
the S/G table is incorrectly generated.
Fix this by handling buflen = k * PAGE_SIZE separately.

Signed-off-by: Robert Baronescu <robert.baronescu@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 crypto/tcrypt.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/crypto/tcrypt.c
+++ b/crypto/tcrypt.c
@@ -225,11 +225,13 @@ static void sg_init_aead(struct scatterl
 	}
 
 	sg_init_table(sg, np + 1);
-	np--;
+	if (rem)
+		np--;
 	for (k = 0; k < np; k++)
 		sg_set_buf(&sg[k + 1], xbuf[k], PAGE_SIZE);
 
-	sg_set_buf(&sg[k + 1], xbuf[k], rem);
+	if (rem)
+		sg_set_buf(&sg[k + 1], xbuf[k], rem);
 }
 
 static void test_aead_speed(const char *algo, int enc, unsigned int secs,