From: Guillaume Chazarain Date: Thu, 1 Feb 2007 07:48:14 +0000 (-0800) Subject: [PATCH] procfs: Fix listing of /proc/NOT_A_TGID/task X-Git-Tag: v2.6.20~23 X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=7d8952440f4090522b740257f1c6b2cf96413969;p=~shefty%2Frdma-dev.git [PATCH] procfs: Fix listing of /proc/NOT_A_TGID/task Listing /proc/PID/task were PID is not a TGID should not result in duplicated entries. [g ~]$ pidof thunderbird-bin 2751 [g ~]$ ls /proc/2751/task 2751 2770 2771 2824 2826 2834 2835 2851 2853 [g ~]$ ls /proc/2770/task 2751 2770 2771 2824 2826 2834 2835 2851 2853 2770 2771 2824 2826 2834 2835 2851 2853 [g ~]$ Signed-off-by: Guillaume Chazarain Acked-by: "Eric W. Biederman" Cc: Oleg Nesterov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/fs/proc/base.c b/fs/proc/base.c index ff7a6685060..1a979ea3b37 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -2328,13 +2328,23 @@ static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldi { struct dentry *dentry = filp->f_path.dentry; struct inode *inode = dentry->d_inode; - struct task_struct *leader = get_proc_task(inode); + struct task_struct *leader = NULL; struct task_struct *task; int retval = -ENOENT; ino_t ino; int tid; unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */ + task = get_proc_task(inode); + if (!task) + goto out_no_task; + rcu_read_lock(); + if (pid_alive(task)) { + leader = task->group_leader; + get_task_struct(leader); + } + rcu_read_unlock(); + put_task_struct(task); if (!leader) goto out_no_task; retval = 0;