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authorOleg Nesterov <oleg@tv-sign.ru>2008-01-15 00:02:37 +0300
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-01-14 13:23:00 -0800
commita98fdcef941e107eeabae622d85a1f476f25a160 (patch)
tree1702a6e810016eea5e995eb7c91a101688e8c59c /include
parent4fd3670eb1d3c33e8952cf1e79edbb2d517dcfb5 (diff)
fix the "remove task_ppid_nr_ns" commit
Commit 84427eaef1fb91704c7112bdb598c810003b99f3 (remove task_ppid_nr_ns) moved the task_tgid_nr_ns(task->real_parent) outside of lock_task_sighand(). This is wrong, ->real_parent could be freed/reused. Both ->parent/real_parent point to nothing after __exit_signal() because we remove the child from ->children list, and thus the child can't be reparented when its parent exits. rcu_read_lock() protects ->parent/real_parent, but _only_ if we know it was valid before we take rcu lock. Revert this part of the patch. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
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