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From: David Howells on 12 May 2010 10:40
cachefiles_determine_cache_security() is expected to return with a security
override in place. However, if set_create_files_as() fails, we fail to do
this. In this case, we should just reinstate the security override that was
set by the caller.

Furthermore, if set_create_files_as() fails, we should dispose of the new
credentials we were in the process of creating.

Signed-off-by: David Howells <dhowells(a)redhat.com>
---

fs/cachefiles/security.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/fs/cachefiles/security.c b/fs/cachefiles/security.c
index b5808cd..039b501 100644
--- a/fs/cachefiles/security.c
+++ b/fs/cachefiles/security.c
@@ -77,6 +77,8 @@ static int cachefiles_check_cache_dir(struct cachefiles_cache *cache,
/*
* check the security details of the on-disk cache
* - must be called with security override in force
+ * - must return with a security override in force - even in the case of an
+ * error
*/
int cachefiles_determine_cache_security(struct cachefiles_cache *cache,
struct dentry *root,
@@ -99,6 +101,8 @@ int cachefiles_determine_cache_security(struct cachefiles_cache *cache,
* which create files */
ret = set_create_files_as(new, root->d_inode);
if (ret < 0) {
+ abort_creds(new);
+ cachefiles_begin_secure(cache, _saved_cred);
_leave(" = %d [cfa]", ret);
return ret;
}

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