ecryptfs: initialize new auth_tokens before teardown

ecryptfs_destroy_mount_crypt_stat() checks whether each
auth_tok->global_auth_tok_key is nonzero and if so puts that key.  However,
in some early mount error paths nothing has initialized the pointer, and we
try to key_put() garbage.  Running the bad cipher tests in the testsuite
exposes this, and it's happy with the following change.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Cc: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c
index 263fed8..f458c1f 100644 (file)
--- a/fs/ecryptfs/keystore.c
+++ b/fs/ecryptfs/keystore.c
@@ -1860,7 +1860,7 @@ ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
        struct ecryptfs_global_auth_tok *new_auth_tok;
        int rc = 0;
 
-       new_auth_tok = kmem_cache_alloc(ecryptfs_global_auth_tok_cache,
+       new_auth_tok = kmem_cache_zalloc(ecryptfs_global_auth_tok_cache,
                                        GFP_KERNEL);
        if (!new_auth_tok) {
                rc = -ENOMEM;