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linux/drivers/block/zram
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Weijie Yang cbfecaffe1 zram: avoid kunmap_atomic() of a NULL pointer 
commit c406515239 upstream.

zram could kunmap_atomic() a NULL pointer in a rare situation: a zram
page becomes a full-zeroed page after a partial write io.  The current
code doesn't handle this case and performs kunmap_atomic() on a NULL
pointer, which panics the kernel.

This patch fixes this issue.

Signed-off-by: Weijie Yang <weijie.yang@samsung.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Weijie Yang <weijie.yang.kh@gmail.com>
Acked-by: Jerome Marchand <jmarchan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
History 2014-11-27 11:21:50 +00:00
..
Kconfig zram: add lz4 algorithm backend 2014-04-07 16:36:01 -07:00
Makefile zram: add lz4 algorithm backend 2014-04-07 16:36:01 -07:00
zcomp.c zram: use scnprintf() in attrs show() methods 2014-04-07 16:36:02 -07:00
zcomp.h zram: propagate error to user 2014-04-07 16:36:02 -07:00
zcomp_lz4.c zram: add lz4 algorithm backend 2014-04-07 16:36:01 -07:00
zcomp_lz4.h zram: add lz4 algorithm backend 2014-04-07 16:36:01 -07:00
zcomp_lzo.c zram: introduce compressing backend abstraction 2014-04-07 16:36:01 -07:00
zcomp_lzo.h zram: introduce compressing backend abstraction 2014-04-07 16:36:01 -07:00
zram_drv.c zram: avoid kunmap_atomic() of a NULL pointer 2014-11-27 11:21:50 +00:00
zram_drv.h zram: make compression algorithm selection possible 2014-04-07 16:36:01 -07:00