Merge tag '4.17-SMB3-Fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull cifs updates from Steve French:
 "Includes SMB3.11 security improvements, as well as various fixes for
  stable and some debugging improvements"

* tag '4.17-SMB3-Fixes' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: Add minor debug message during negprot
  smb3: Fix root directory when server returns inode number of zero
  cifs: fix sparse warning on previous patch in a few printks
  cifs: add server->vals->header_preamble_size
  cifs: smbd: disconnect transport on RDMA errors
  cifs: smbd: avoid reconnect lockup
  Don't log confusing message on reconnect by default
  Don't log expected error on DFS referral request
  fs: cifs: Replace _free_xid call in cifs_root_iget function
  SMB3.1.1 dialect is no longer experimental
  Tree connect for SMB3.1.1 must be signed for non-encrypted shares
  fix smb3-encryption breakage when CONFIG_DEBUG_SG=y
  CIFS: fix sha512 check in cifs_crypto_secmech_release
  CIFS: implement v3.11 preauth integrity
  CIFS: add sha512 secmech
  CIFS: refactor crypto shash/sdesc allocation&free
  Update README file for cifs.ko
  Update TODO list for cifs.ko
  cifs: fix memory leak in SMB2_open()
  CIFS: SMBD: fix spelling mistake: "faield" and "legnth"

1 files changed, 54 insertions, 0 deletions

diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index a0dbced4a45c..460084a8eac5 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -848,3 +848,57 @@ setup_aio_ctx_iter(struct cifs_aio_ctx *ctx, struct iov_iter *iter, int rw)
 	iov_iter_bvec(&ctx->iter, ITER_BVEC | rw, ctx->bv, npages, ctx->len);
 	return 0;
 }
+
+/**
+ * cifs_alloc_hash - allocate hash and hash context together
+ *
+ * The caller has to make sure @sdesc is initialized to either NULL or
+ * a valid context. Both can be freed via cifs_free_hash().
+ */
+int
+cifs_alloc_hash(const char *name,
+		struct crypto_shash **shash, struct sdesc **sdesc)
+{
+	int rc = 0;
+	size_t size;
+
+	if (*sdesc != NULL)
+		return 0;
+
+	*shash = crypto_alloc_shash(name, 0, 0);
+	if (IS_ERR(*shash)) {
+		cifs_dbg(VFS, "could not allocate crypto %s\n", name);
+		rc = PTR_ERR(*shash);
+		*shash = NULL;
+		*sdesc = NULL;
+		return rc;
+	}
+
+	size = sizeof(struct shash_desc) + crypto_shash_descsize(*shash);
+	*sdesc = kmalloc(size, GFP_KERNEL);
+	if (*sdesc == NULL) {
+		cifs_dbg(VFS, "no memory left to allocate crypto %s\n", name);
+		crypto_free_shash(*shash);
+		*shash = NULL;
+		return -ENOMEM;
+	}
+
+	(*sdesc)->shash.tfm = *shash;
+	(*sdesc)->shash.flags = 0x0;
+	return 0;
+}
+
+/**
+ * cifs_free_hash - free hash and hash context together
+ *
+ * Freeing a NULL hash or context is safe.
+ */
+void
+cifs_free_hash(struct crypto_shash **shash, struct sdesc **sdesc)
+{
+	kfree(*sdesc);
+	*sdesc = NULL;
+	if (*shash)
+		crypto_free_shash(*shash);
+	*shash = NULL;
+}