zram: protect sysfs handler from invalid memory access

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Use zram->init_lock to protect access to zram->meta, otherwise it
may cause invalid memory access if zram->meta has been freed by
zram_reset_device().

This issue may be triggered by:
Thread 1:
while true; do cat mem_used_total; done
Thread 2:
while true; do echo 8M > disksize; echo 1 > reset; done

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Jiang Liu 2013-06-07 00:07:27 +08:00 • committed by Greg Kroah-Hartman

parent 12a7ad3b81

commit 5863e10b44

1 changed files with 2 additions and 0 deletions

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drivers/staging/zram/zram_sysfs.c

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