crypto: af_alg - Allow arbitrarily long algorithm names

This patch removes the hard-coded 64-byte limit on the length
of the algorithm name through bind(2).  The address length can
now exceed that.  The user-space structure remains unchanged.
In order to use a longer name simply extend the salg_name array
beyond its defined 64 bytes length.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index 690deca17c35287c00171466f7b06e53262b0601..3556d8eb54a740741fcb282d6c39f5d942ea79f5 100644 (file)
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -160,11 +160,11 @@ static int alg_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
        if (sock->state == SS_CONNECTED)
                return -EINVAL;
 
-       if (addr_len != sizeof(*sa))
+       if (addr_len < sizeof(*sa))
                return -EINVAL;
 
        sa->salg_type[sizeof(sa->salg_type) - 1] = 0;
-       sa->salg_name[sizeof(sa->salg_name) - 1] = 0;
+       sa->salg_name[sizeof(sa->salg_name) + addr_len - sizeof(*sa) - 1] = 0;
 
        type = alg_get_type(sa->salg_type);
        if (IS_ERR(type) && PTR_ERR(type) == -ENOENT) {