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authorAl Viro <viro@zeniv.linux.org.uk>2011-02-16 06:22:54 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2011-03-23 23:36:50 +0300
commitec6fd8a4355cda81cd9f06bebc048e83eb514ac7 (patch)
tree828c3f2e1b474cc0ec9768d5dc19cfa2c086898f /fs/proc
parentca6b0bf0e086513b9ee5efc0aa5770ecb57778af (diff)
downloadlinux-ec6fd8a4355cda81cd9f06bebc048e83eb514ac7.tar.xz
report errors in /proc/*/*map* sanely
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/base.c8
-rw-r--r--fs/proc/task_mmu.c10
-rw-r--r--fs/proc/task_nommu.c6
3 files changed, 13 insertions, 11 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index df73573e12c9..c28281102082 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 c966413c139b..8fed0f88fbf7 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 b535d3e5d5f1..980de547c070 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);