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| author | Weijie Yang <weijie.yang@samsung.com> | 2014-10-29 22:50:57 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-10-30 00:33:15 +0100 |
| commit | 5a99e95b8d1cd47f6feddcdca6c71d22060df8a2 (patch) | |
| tree | 51384759dcfdc6e189139a5a58a5df7f6e16f56b /mm/balloon_compaction.c | |
| parent | mm/slab_common: don't check for duplicate cache names (diff) | |
| download | linux-5a99e95b8d1cd47f6feddcdca6c71d22060df8a2.tar.xz linux-5a99e95b8d1cd47f6feddcdca6c71d22060df8a2.zip | |
zram: avoid NULL pointer access in concurrent situation
There is a rare NULL pointer bug in mem_used_total_show() and
mem_used_max_store() in concurrent situation, like this:
zram is not initialized, process A is a mem_used_total reader which runs
periodically, while process B try to init zram.
process A process B
access meta, get a NULL value
init zram, done
init_done() is true
access meta->mem_pool, get a NULL pointer BUG
This patch fixes this issue.
Signed-off-by: Weijie Yang <weijie.yang@samsung.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Acked-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/balloon_compaction.c')
0 files changed, 0 insertions, 0 deletions