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staging: android: ion: Bail out upon SIGKILL when allocating memory.

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syzbot found that a thread can stall for minutes inside
ion_system_heap_allocate() after that thread was killed by SIGKILL [1].
Let's check for SIGKILL before doing memory allocation.

[1] https://syzkaller.appspot.com/bug?id=a0e3436829698d5824231251fad9d8e998f94f5e

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: stable <stable@vger.kernel.org>
Reported-by: syzbot <syzbot+8ab2d0f39fb79fe6ca40@syzkaller.appspotmail.com>
Acked-by: Laura Abbott <labbott@redhat.com>
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: https://lore.kernel.org/r/d088f188-5f32-d8fc-b9a0-0b404f7501cc@I-love.SAKURA.ne.jp
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tetsuo Handa 2019-07-01 19:55:19 +09:00 committed by Greg Kroah-Hartman
parent 92e3e88488
commit 8f9e86ee79
1 changed files with 3 additions and 0 deletions
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3
drivers/staging/android/ion/ion_page_pool.c
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@ -8,11 +8,14 @@
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/swap.h>
#include <linux/sched/signal.h>
#include "ion.h"
static inline struct page *ion_page_pool_alloc_pages(struct ion_page_pool *pool)
{
if (fatal_signal_pending(current))
return NULL;
return alloc_pages(pool->gfp_mask, pool->order);
}