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authorIan Kent <raven@themaw.net>2011-01-14 21:46:30 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2011-01-16 04:07:43 +0300
commit9e3fea16ba386fa549a0b2de8a203e5d412997a0 (patch)
tree88ee7f612240f8e33cc57d07a011a07db6280804 /fs/autofs4
parent6651149371b842715906311b4631b8489cebf7e8 (diff)
downloadlinux-9e3fea16ba386fa549a0b2de8a203e5d412997a0.tar.xz
autofs4: Fix wait validation
It is possible for the check in wait.c:validate_request() to return an incorrect result if the dentry that was mounted upon has changed during the callback. Signed-off-by: Ian Kent <raven@themaw.net> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/autofs4')
-rw-r--r--fs/autofs4/waitq.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
index c5f8459c905e..56010056b2e6 100644
--- a/fs/autofs4/waitq.c
+++ b/fs/autofs4/waitq.c
@@ -309,6 +309,9 @@ static int validate_request(struct autofs_wait_queue **wait,
* completed while we waited on the mutex ...
*/
if (notify == NFY_MOUNT) {
+ struct dentry *new = NULL;
+ int valid = 1;
+
/*
* If the dentry was successfully mounted while we slept
* on the wait queue mutex we can return success. If it
@@ -316,8 +319,20 @@ static int validate_request(struct autofs_wait_queue **wait,
* a multi-mount with no mount at it's base) we can
* continue on and create a new request.
*/
+ if (!IS_ROOT(dentry)) {
+ if (dentry->d_inode && d_unhashed(dentry)) {
+ struct dentry *parent = dentry->d_parent;
+ new = d_lookup(parent, &dentry->d_name);
+ if (new)
+ dentry = new;
+ }
+ }
if (have_submounts(dentry))
- return 0;
+ valid = 0;
+
+ if (new)
+ dput(new);
+ return valid;
}
return 1;