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| author | Weijie Yang <weijie.yang@samsung.com> | 2014-11-14 02:19:05 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-11-14 03:17:05 +0300 |
| commit | c406515239376fc93a30d5d03192182160cbd3fb (patch) | |
| tree | 41269ecf1d06e46fce5164d02b0b29ca78e8976e /mm/page_isolation.c | |
| parent | 2c54396e40c79876a7ddfd3231c81eedf639795b (diff) | |
| download | linux-c406515239376fc93a30d5d03192182160cbd3fb.tar.xz | |
zram: avoid kunmap_atomic() of a NULL pointer
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>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_isolation.c')
0 files changed, 0 insertions, 0 deletions