diff options
| author | Alexey Dobriyan <adobriyan@openvz.org> | 2007-05-08 00:25:45 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-08 11:15:01 -0700 |
| commit | 7695650a924a6859910c8c19dfa43b4d08224d66 (patch) | |
| tree | 5947c3e1b24600b6440468c11b30feeef31eee2c /fs/proc/generic.c | |
| parent | 79c0b2df79eb56fc71e54c75cd7fb3acf84370f9 (diff) | |
| download | lwn-7695650a924a6859910c8c19dfa43b4d08224d66.tar.gz lwn-7695650a924a6859910c8c19dfa43b4d08224d66.zip | |
Fix race between proc_get_inode() and remove_proc_entry()
proc_lookup remove_proc_entry
=========== =================
lock_kernel();
spin_lock(&proc_subdir_lock);
[find PDE with refcount 0]
spin_unlock(&proc_subdir_lock);
spin_lock(&proc_subdir_lock);
[find PDE with refcount 0]
[check refcount and free PDE]
spin_unlock(&proc_subdir_lock);
proc_get_inode:
de_get(de); /* boom */
Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc/generic.c')
| -rw-r--r-- | fs/proc/generic.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/proc/generic.c b/fs/proc/generic.c index 775fb21294d8..22a08ff3475d 100644 --- a/fs/proc/generic.c +++ b/fs/proc/generic.c @@ -398,6 +398,7 @@ struct dentry *proc_lookup(struct inode * dir, struct dentry *dentry, struct nam if (!memcmp(dentry->d_name.name, de->name, de->namelen)) { unsigned int ino = de->low_ino; + de_get(de); spin_unlock(&proc_subdir_lock); error = -EINVAL; inode = proc_get_inode(dir->i_sb, ino, de); @@ -414,6 +415,7 @@ struct dentry *proc_lookup(struct inode * dir, struct dentry *dentry, struct nam d_add(dentry, inode); return NULL; } + de_put(de); return ERR_PTR(error); } |