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authorAndrew Morton <akpm@linux-foundation.org>2008-07-05 15:29:05 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-05 16:07:56 -0400
commit20cbc972617069c1ed434f62151e4de57d26ea46 (patch)
tree067d4d64badaa772a8c132c03f4e42875e35e3c4
parentfbe0825752dc34b505777fd59cde4a6ce832eb16 (diff)
Fix clear_refs_write() use of struct mm_walk
Don't use a static entry, so as to prevent races during concurrent use of this function. Reported-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: Matt Mackall <mpm@selenic.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/proc/task_mmu.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index ab8ccc9d14ff..05053d701ac5 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -476,10 +476,10 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
476 return -ESRCH; 476 return -ESRCH;
477 mm = get_task_mm(task); 477 mm = get_task_mm(task);
478 if (mm) { 478 if (mm) {
479 static struct mm_walk clear_refs_walk; 479 struct mm_walk clear_refs_walk = {
480 memset(&clear_refs_walk, 0, sizeof(clear_refs_walk)); 480 .pmd_entry = clear_refs_pte_range,
481 clear_refs_walk.pmd_entry = clear_refs_pte_range; 481 .mm = mm,
482 clear_refs_walk.mm = mm; 482 };
483 down_read(&mm->mmap_sem); 483 down_read(&mm->mmap_sem);
484 for (vma = mm->mmap; vma; vma = vma->vm_next) { 484 for (vma = mm->mmap; vma; vma = vma->vm_next) {
485 clear_refs_walk.private = vma; 485 clear_refs_walk.private = vma;