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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>
This commit is contained in:
Minchan Kim 2014-03-03 15:38:34 -08:00 committed by Linus Torvalds
parent a5f6ea29f9
commit db5d711e2d
1 changed files with 2 additions and 0 deletions
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2
drivers/block/zram/zram_drv.c
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@ -612,6 +612,8 @@ static ssize_t disksize_store(struct device *dev,
disksize = PAGE_ALIGN(disksize); disksize = PAGE_ALIGN(disksize);
meta = zram_meta_alloc(disksize); meta = zram_meta_alloc(disksize);
if (!meta)
return -ENOMEM;
down_write(&zram->init_lock); down_write(&zram->init_lock);
if (zram->init_done) { if (zram->init_done) {
up_write(&zram->init_lock); up_write(&zram->init_lock);