RPCSEC_GSS: fix leak in krb5 code caused by superfluous kmalloc

I was sloppy when generating a previous patch; I modified the callers of
krb5_make_checksum() to allocate memory for the buffer where the result is
returned, then forgot to modify krb5_make_checksum to stop allocating that
memory itself.  The result is a per-packet memory leak.  This fixes the
problem by removing the now-superfluous kmalloc().

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/net/sunrpc/auth_gss/gss_krb5_crypto.c b/net/sunrpc/auth_gss/gss_krb5_crypto.c
index 97c981f..76b969e 100644 (file)
--- a/net/sunrpc/auth_gss/gss_krb5_crypto.c
+++ b/net/sunrpc/auth_gss/gss_krb5_crypto.c
@@ -212,7 +212,6 @@ make_checksum(s32 cksumtype, char *header, int hdrlen, struct xdr_buf *body,
        char                            *cksumname;
        struct crypto_tfm               *tfm = NULL; /* XXX add to ctx? */
        struct scatterlist              sg[1];
-       u32                             code = GSS_S_FAILURE;
 
        switch (cksumtype) {
                case CKSUMTYPE_RSA_MD5:
@@ -221,13 +220,11 @@ make_checksum(s32 cksumtype, char *header, int hdrlen, struct xdr_buf *body,
                default:
                        dprintk("RPC:      krb5_make_checksum:"
                                " unsupported checksum %d", cksumtype);
-                       goto out;
+                       return GSS_S_FAILURE;
        }
        if (!(tfm = crypto_alloc_tfm(cksumname, CRYPTO_TFM_REQ_MAY_SLEEP)))
-               goto out;
+               return GSS_S_FAILURE;
        cksum->len = crypto_tfm_alg_digestsize(tfm);
-       if ((cksum->data = kmalloc(cksum->len, GFP_KERNEL)) == NULL)
-               goto out;
 
        crypto_digest_init(tfm);
        sg_set_buf(sg, header, hdrlen);
@@ -235,10 +232,8 @@ make_checksum(s32 cksumtype, char *header, int hdrlen, struct xdr_buf *body,
        process_xdr_buf(body, body_offset, body->len - body_offset,
                        checksummer, tfm);
        crypto_digest_final(tfm, cksum->data);
-       code = 0;
-out:
        crypto_free_tfm(tfm);
-       return code;
+       return 0;
 }
 
 EXPORT_SYMBOL(make_checksum);