Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b228b8e5bf96b740a70871c1a248bb65c267f5f2
Commit: b228b8e5bf96b740a70871c1a248bb65c267f5f2
Parent: ad28d94abb1313bdf27e196676292c493f92f824
Author: Michael Halcrow <[EMAIL PROTECTED]>
AuthorDate: Fri Mar 16 13:38:22 2007 -0800
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Fri Mar 16 19:25:05 2007 -0700
[PATCH] eCryptfs: fix possible NULL ptr deref in ecryptfs_d_release()
ecryptfs_d_release() first dereferences a pointer (via
ecryptfs_dentry_to_lower()) and then afterwards checks to see if the
pointer it just dereferenced is NULL (via ecryptfs_dentry_to_private()).
This patch moves all of the work done on the dereferenced pointer inside a
block governed by the condition that the pointer is non-NULL.
Signed-off-by: Michael Halcrow <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
fs/ecryptfs/dentry.c | 15 +++++----------
1 files changed, 5 insertions(+), 10 deletions(-)
diff --git a/fs/ecryptfs/dentry.c b/fs/ecryptfs/dentry.c
index 329efcd..cb20b96 100644
--- a/fs/ecryptfs/dentry.c
+++ b/fs/ecryptfs/dentry.c
@@ -78,18 +78,13 @@ struct kmem_cache *ecryptfs_dentry_info_cache;
*/
static void ecryptfs_d_release(struct dentry *dentry)
{
- struct dentry *lower_dentry;
-
- lower_dentry = ecryptfs_dentry_to_lower(dentry);
- if (ecryptfs_dentry_to_private(dentry))
+ if (ecryptfs_dentry_to_private(dentry)) {
+ if (ecryptfs_dentry_to_lower(dentry)) {
+ mntput(ecryptfs_dentry_to_lower_mnt(dentry));
+ dput(ecryptfs_dentry_to_lower(dentry));
+ }
kmem_cache_free(ecryptfs_dentry_info_cache,
ecryptfs_dentry_to_private(dentry));
- if (lower_dentry) {
- struct vfsmount *lower_mnt =
- ecryptfs_dentry_to_lower_mnt(dentry);
-
- mntput(lower_mnt);
- dput(lower_dentry);
}
return;
}
-
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