[S390] prng: fix pointer arithmetic

The git commit c708c57e247775928b9a6bce7b4d8d14883bf39b fixed the
access beyond the end of the stack in prng_seed but the pointer
arithmetic is still incorrect. The calculation has been off by
a factor of 64, now it is only off by a factor of 8. prng_seed
is called with a maximum of 16 for nbytes, small enough that
the incorrect calculation stays insides the limits of the stack.
Place parentheses for correct pointer arithmetic.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/crypto/prng.c b/arch/s390/crypto/prng.c
index 44bca3f994b0892bed53541e238e1d8bf9aeff58..8b16c479585b271db83330e68529634e5e5e4735 100644 (file)
--- a/arch/s390/crypto/prng.c
+++ b/arch/s390/crypto/prng.c
@@ -76,7 +76,7 @@ static void prng_seed(int nbytes)
 
        /* Add the entropy */
        while (nbytes >= 8) {
-               *((__u64 *)parm_block) ^= *((__u64 *)buf+i);
+               *((__u64 *)parm_block) ^= *((__u64 *)(buf+i));
                prng_add_entropy();
                i += 8;
                nbytes -= 8;