From 7fcaf62a9f6348bcdc8d2816f93f64cf7f3f87fc Mon Sep 17 00:00:00 2001
From: Tudor Ambarus <tudor-dan.ambarus@nxp.com>
Date: Tue, 25 Apr 2017 16:26:36 +0300
Subject: [PATCH] crypto: caam - avoid kzalloc(0) in caam_read_raw_data
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The function returns NULL if buf is composed only of zeros.

Signed-off-by: Tudor Ambarus <tudor-dan.ambarus@nxp.com>
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---
 drivers/crypto/caam/caampkc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/crypto/caam/caampkc.c b/drivers/crypto/caam/caampkc.c
index 49cbdcb..999ba18 100644
--- a/drivers/crypto/caam/caampkc.c
+++ b/drivers/crypto/caam/caampkc.c
@@ -374,6 +374,8 @@ static inline u8 *caam_read_raw_data(const u8 *buf, size_t *nbytes)
 		buf++;
 		(*nbytes)--;
 	}
+	if (!*nbytes)
+		return NULL;
 
 	val = kzalloc(*nbytes, GFP_DMA | GFP_KERNEL);
 	if (!val)
-- 
2.7.4