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 49cbdcb..999ba18 100644 (file)
--- 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)