The patch titled
Subject: zram-fix-null-dereference-of-handle-v2
has been added to the -mm tree. Its filename is
zram-fix-null-dereference-of-handle-v2.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/zram-fix-null-dereference-of-handle-v2.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/zram-fix-null-dereference-of-handle-v2.patch
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------------------------------------------------------
From: Minchan Kim <minchan@xxxxxxxxxx>
Subject: zram-fix-null-dereference-of-handle-v2
* From v1:
* remove unlikely branch - Sergey
* In !handle case, use 0 instead of zram_get_element - Sergey
Link: http://lkml.kernel.org/r/1505887347-10881-1-git-send-email-minchan@xxxxxxxxxx
Fixes: 1f7319c74275 ("zram: partial IO refactoring")
Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky.work@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/block/zram/zram_drv.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff -puN drivers/block/zram/zram_drv.c~zram-fix-null-dereference-of-handle-v2 drivers/block/zram/zram_drv.c
--- a/drivers/block/zram/zram_drv.c~zram-fix-null-dereference-of-handle-v2
+++ a/drivers/block/zram/zram_drv.c
@@ -865,11 +865,13 @@ static int __zram_bvec_read(struct zram
zram_slot_lock(zram, index);
handle = zram_get_handle(zram, index);
- if (unlikely(!handle || zram_test_flag(zram, index, ZRAM_SAME))) {
+ if (!handle || zram_test_flag(zram, index, ZRAM_SAME)) {
+ unsigned long value;
void *mem;
+ value = handle ? zram_get_element(zram, index) : 0;
mem = kmap_atomic(page);
- zram_fill_page(mem, PAGE_SIZE, zram_get_element(zram, index));
+ zram_fill_page(mem, PAGE_SIZE, value);
kunmap_atomic(mem);
zram_slot_unlock(zram, index);
return 0;
_
Patches currently in -mm which might be from minchan@xxxxxxxxxx are
zram-fix-null-dereference-of-handle.patch
zram-fix-null-dereference-of-handle-v2.patch
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