From 7ac512aa8237c43331ffaf77a4fd8b8d684819ba Mon Sep 17 00:00:00 2001
From: David Howells <dhowells@redhat.com>
Date: Wed, 12 May 2010 15:34:03 +0100
Subject: [PATCH] CacheFiles: Fix error handling in
cachefiles_determine_cache_security()
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@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
fs/cachefiles/security.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/fs/cachefiles/security.c b/fs/cachefiles/security.c
index b5808cdb22325..039b5011d83b0 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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