zram: avoid null access when fail to alloc meta
zram_meta_alloc could fail so caller should check it. Otherwise, your system will hang. Signed-off-by: Minchan Kim <minchan@kernel.org> Acked-by: Jerome Marchand <jmarchan@redhat.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -612,6 +612,8 @@ static ssize_t disksize_store(struct device *dev,
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disksize = PAGE_ALIGN(disksize);
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meta = zram_meta_alloc(disksize);
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if (!meta)
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return -ENOMEM;
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down_write(&zram->init_lock);
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if (zram->init_done) {
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up_write(&zram->init_lock);
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