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Staging: android: lowmemorykiller: fix possible android low memory killer NULL pointer

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get_mm_rss() atomically dereferences the actual without checking for a
NULL pointer, which is possible since task_lock() is not held.

Cc: San Mehat <san@android.com>
Cc: Arve Hjønnevåg <arve@android.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
David Rientjes 2009-05-11 15:45:14 -07:00 committed by Greg Kroah-Hartman
parent 34006e11ee
commit 5d14a573a4
1 changed files with 8 additions and 2 deletions
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10
drivers/staging/android/lowmemorykiller.c
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@ -92,12 +92,18 @@ static int lowmem_shrink(int nr_to_scan, gfp_t gfp_mask)
for_each_process(p) {
int oom_adj;
if (!p->mm)
task_lock(p);
if (!p->mm) {
task_unlock(p);
continue;
}
oom_adj = p->oomkilladj;
if (oom_adj < min_adj)
if (oom_adj < min_adj) {
task_unlock(p);
continue;
}
tasksize = get_mm_rss(p->mm);
task_unlock(p);
if (tasksize <= 0)
continue;
if (selected) {