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Date: Sun, 26 Oct 2014 10:44:50 +0900 From: Minchan Kim <minchan@...nel.org> To: Weijie Yang <weijie.yang@...sung.com> Cc: 'Andrew Morton' <akpm@...ux-foundation.org>, 'Dan Streetman' <ddstreet@...e.org>, 'Sergey Senozhatsky' <sergey.senozhatsky@...il.com>, 'Nitin Gupta' <ngupta@...are.org>, 'Linux-MM' <linux-mm@...ck.org>, 'linux-kernel' <linux-kernel@...r.kernel.org>, 'Weijie Yang' <weijie.yang.kh@...il.com> Subject: Re: [PATCH 2/2] zram: avoid NULL pointer access when reading mem_used_total On Sat, Oct 25, 2014 at 05:26:31PM +0800, Weijie Yang wrote: > There is a rare NULL pointer bug in mem_used_total_show() in concurrent > situation, like this: > zram is not initialized, process A is a mem_used_total reader which runs > periodicity, while process B try to init zram. > > process A process B > access meta, get a NULL value > init zram, done > init_done() is true > access meta->mem_pool, get a NULL pointer BUG > > This patch fixes this issue. > > Signed-off-by: Weijie Yang <weijie.yang@...sung.com> Acked-by: Minchan Kim <minchan@...nel.org> Thanks! -- Kind regards, Minchan Kim -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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