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authorOleg Nesterov <oleg@redhat.com>2014-10-10 02:25:49 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-10-10 06:25:49 +0400
commit47fecca15c0944924423390fe21b956eea57da30 (patch)
tree4844cb02728511c6d4b74b11b3781330312de2a3 /fs/proc/internal.h
parent27692cd56e2aa6924b49f4361247d707a023484a (diff)
downloadlinux-47fecca15c0944924423390fe21b956eea57da30.tar.xz
fs/proc/task_nommu.c: don't use priv->task->mm
I do not know if CONFIG_PREEMPT/SMP is possible without CONFIG_MMU but the usage of task->mm in m_stop(). The task can exit/exec before we take mmap_sem, in this case m_stop() can hit NULL or unlock the wrong rw_semaphore. Also, this code uses priv->task != NULL to decide whether we need up_read/mmput. This is correct, but we will probably kill priv->task. Change m_start/m_stop to rely on IS_ERR_OR_NULL() like task_mmu.c does. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Cyrill Gorcunov <gorcunov@openvz.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: Greg Ungerer <gerg@uclinux.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc/internal.h')
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