diff options
| -rw-r--r-- | fs/proc/base.c | 54 |
1 files changed, 29 insertions, 25 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index f435932e643..98eaeaa9fdd 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -1402,6 +1402,7 @@ static struct dentry *proc_lookupfd(struct inode * dir, struct dentry * dentry, { struct task_struct *task = proc_task(dir); unsigned fd = name_to_int(dentry); + struct dentry *result = ERR_PTR(-ENOENT); struct file * file; struct files_struct * files; struct inode *inode; @@ -1441,15 +1442,18 @@ static struct dentry *proc_lookupfd(struct inode * dir, struct dentry * dentry, ei->op.proc_get_link = proc_fd_link; dentry->d_op = &tid_fd_dentry_operations; d_add(dentry, inode); - return NULL; + /* Close the race of the process dying before we return the dentry */ + if (tid_fd_revalidate(dentry, NULL)) + result = NULL; +out: + return result; out_unlock2: spin_unlock(&files->file_lock); put_files_struct(files); out_unlock: iput(inode); -out: - return ERR_PTR(-ENOENT); + goto out; } static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir); @@ -1549,12 +1553,12 @@ static struct dentry *proc_pident_lookup(struct inode *dir, struct pid_entry *ents) { struct inode *inode; - int error; + struct dentry *error; struct task_struct *task = proc_task(dir); struct pid_entry *p; struct proc_inode *ei; - error = -ENOENT; + error = ERR_PTR(-ENOENT); inode = NULL; if (!pid_alive(task)) @@ -1569,7 +1573,7 @@ static struct dentry *proc_pident_lookup(struct inode *dir, if (!p->name) goto out; - error = -EINVAL; + error = ERR_PTR(-EINVAL); inode = proc_pid_make_inode(dir->i_sb, task, p->type); if (!inode) goto out; @@ -1736,14 +1740,16 @@ static struct dentry *proc_pident_lookup(struct inode *dir, default: printk("procfs: impossible type (%d)",p->type); iput(inode); - return ERR_PTR(-EINVAL); + error = ERR_PTR(-EINVAL); + goto out; } dentry->d_op = &pid_dentry_operations; d_add(dentry, inode); - return NULL; - + /* Close the race of the process dying before we return the dentry */ + if (pid_revalidate(dentry, NULL)) + error = NULL; out: - return ERR_PTR(error); + return error; } static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ @@ -1911,6 +1917,7 @@ out: /* SMP-safe */ struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) { + struct dentry *result = ERR_PTR(-ENOENT); struct task_struct *task; struct inode *inode; struct proc_inode *ei; @@ -1944,12 +1951,9 @@ struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct goto out; inode = proc_pid_make_inode(dir->i_sb, task, PROC_TGID_INO); + if (!inode) + goto out_put_task; - - if (!inode) { - put_task_struct(task); - goto out; - } inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; inode->i_op = &proc_tgid_base_inode_operations; inode->i_fop = &proc_tgid_base_operations; @@ -1963,21 +1967,20 @@ struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct dentry->d_op = &pid_dentry_operations; d_add(dentry, inode); - if (!pid_alive(task)) { - d_drop(dentry); - shrink_dcache_parent(dentry); - goto out; - } + /* Close the race of the process dying before we return the dentry */ + if (pid_revalidate(dentry, NULL)) + result = NULL; +out_put_task: put_task_struct(task); - return NULL; out: - return ERR_PTR(-ENOENT); + return result; } /* SMP-safe */ static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) { + struct dentry *result = ERR_PTR(-ENOENT); struct task_struct *task; struct task_struct *leader = proc_task(dir); struct inode *inode; @@ -2015,13 +2018,14 @@ static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry dentry->d_op = &pid_dentry_operations; d_add(dentry, inode); + /* Close the race of the process dying before we return the dentry */ + if (pid_revalidate(dentry, NULL)) + result = NULL; - put_task_struct(task); - return NULL; out_drop_task: put_task_struct(task); out: - return ERR_PTR(-ENOENT); + return result; } #define PROC_NUMBUF 10 |