From: Tudor Ambarus <tudor-dan.ambarus@nxp.com>
Date: Tue, 25 Apr 2017 13:26:36 +0000 (+0300)
Subject: crypto: caam - avoid kzalloc(0) in caam_read_raw_data
X-Git-Tag: v4.13-rc1~158^2~135
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=7fcaf62a9f6348bcdc8d2816f93f64cf7f3f87fc;p=thirdparty%2Fkernel%2Flinux.git

crypto: caam - avoid kzalloc(0) in caam_read_raw_data

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>
---

diff --git a/drivers/crypto/caam/caampkc.c b/drivers/crypto/caam/caampkc.c
index 49cbdcba78830..999ba18495b0f 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)