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Commit 2741a559 authored by Paul Jackson's avatar Paul Jackson Committed by Linus Torvalds
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[PATCH] cpuset: unsafe mm reference fix 



Fix unsafe reference to a tasks mm struct, by moving the reference inside of a
convenient nearby properly guarded code block.

Signed-off-by: default avatarPaul Jackson <pj@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 4a01c8d5

kernel/cpuset.c

+2 −2
Original line number Diff line number Diff line
@@ -1183,11 +1183,11 @@ static int attach_task(struct cpuset *cs, char *pidbuf, char **ppathbuf) 
	mm = get_task_mm(tsk);

	if (mm) {

		mpol_rebind_mm(mm, &to);

		if (is_memory_migrate(cs))

			do_migrate_pages(mm, &from, &to, MPOL_MF_MOVE_ALL);

		mmput(mm);

	}



	if (is_memory_migrate(cs))

		do_migrate_pages(tsk->mm, &from, &to, MPOL_MF_MOVE_ALL);

	put_task_struct(tsk);

	synchronize_rcu();

	if (atomic_dec_and_test(&oldcs->count))