diff options
| -rw-r--r-- | fs/proc/base.c | 8 | ||||
| -rw-r--r-- | fs/proc/task_mmu.c | 10 | ||||
| -rw-r--r-- | fs/proc/task_nommu.c | 6 |
3 files changed, 13 insertions, 11 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index df73573..c282811 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -225,15 +225,17 @@ static int check_mem_permission(struct task_struct *task) struct mm_struct *mm_for_maps(struct task_struct *task) { struct mm_struct *mm; + int err; - if (mutex_lock_killable(&task->signal->cred_guard_mutex)) - return NULL; + err = mutex_lock_killable(&task->signal->cred_guard_mutex); + if (err) + return ERR_PTR(err); mm = get_task_mm(task); if (mm && mm != current->mm && !ptrace_may_access(task, PTRACE_MODE_READ)) { mmput(mm); - mm = NULL; + mm = ERR_PTR(-EACCES); } mutex_unlock(&task->signal->cred_guard_mutex); diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index c966413..8fed0f8 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -119,11 +119,11 @@ static void *m_start(struct seq_file *m, loff_t *pos) priv->task = get_pid_task(priv->pid, PIDTYPE_PID); if (!priv->task) - return NULL; + return ERR_PTR(-ESRCH); mm = mm_for_maps(priv->task); - if (!mm) - return NULL; + if (!mm || IS_ERR(mm)) + return mm; down_read(&mm->mmap_sem); tail_vma = get_gate_vma(priv->task); @@ -728,9 +728,9 @@ static ssize_t pagemap_read(struct file *file, char __user *buf, if (!task) goto out; - ret = -EACCES; mm = mm_for_maps(task); - if (!mm) + ret = PTR_ERR(mm); + if (!mm || IS_ERR(mm)) goto out_task; ret = -EINVAL; diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c index b535d3e..980de54 100644 --- a/fs/proc/task_nommu.c +++ b/fs/proc/task_nommu.c @@ -199,13 +199,13 @@ static void *m_start(struct seq_file *m, loff_t *pos) /* pin the task and mm whilst we play with them */ priv->task = get_pid_task(priv->pid, PIDTYPE_PID); if (!priv->task) - return NULL; + return ERR_PTR(-ESRCH); mm = mm_for_maps(priv->task); - if (!mm) { + if (!mm || IS_ERR(mm)) { put_task_struct(priv->task); priv->task = NULL; - return NULL; + return mm; } down_read(&mm->mmap_sem); |