The patch titled
Subject: mm/zpool: allow NULL `zpool' pointer in zpool_destroy_pool()
has been removed from the -mm tree. Its filename was
mm-zpool-allow-null-zpool-pointer-in-zpool_destroy_pool.patch
This patch was dropped because it was withdrawn
------------------------------------------------------
From: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Subject: mm/zpool: allow NULL `zpool' pointer in zpool_destroy_pool()
zpool_destroy_pool() does not tolerate a NULL zpool pointer argument and
performs a NULL-pointer dereference. Although there is only one
zpool_destroy_pool() user (as of 4.1), still update it to be coherent with
the corresponding destroy() functions of the remainig pool-allocators
(slab, mempool, etc.), which now allow NULL pool-pointers.
For consistency, tweak zpool_destroy_pool() and NULL-check the
pointer there.
Proposed by Andrew Morton.
Link: https://lkml.org/lkml/2015/6/8/583
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Julia Lawall <julia.lawall@xxxxxxx>
Acked-by: Dan Streetman <ddstreet@xxxxxxxx>
Cc: Joe Perches <joe@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/zpool.c | 3 +++
1 file changed, 3 insertions(+)
diff -puN mm/zpool.c~mm-zpool-allow-null-zpool-pointer-in-zpool_destroy_pool mm/zpool.c
--- a/mm/zpool.c~mm-zpool-allow-null-zpool-pointer-in-zpool_destroy_pool
+++ a/mm/zpool.c
@@ -177,6 +177,9 @@ void zpool_destroy_pool(struct zpool *zp
{
pr_debug("destroying pool type %s\n", zpool->type);
+ if (unlikely(!zpool))
+ return;
+
spin_lock(&pools_lock);
list_del(&zpool->list);
spin_unlock(&pools_lock);
_
Patches currently in -mm which might be from sergey.senozhatsky@xxxxxxxxx are
mm-slab_common-allow-null-cache-pointer-in-kmem_cache_destroy.patch
mm-mempool-allow-null-pool-pointer-in-mempool_destroy.patch
mm-dmapool-allow-null-pool-pointer-in-dma_pool_destroy.patch
mm-zsmalloc-allow-null-pool-pointer-in-zs_destroy_pool.patch
zsmalloc-drop-unused-variable-nr_to_migrate.patch
zsmalloc-always-keep-per-class-stats.patch
zsmalloc-introduce-zs_can_compact-function.patch
zsmalloc-cosmetic-compaction-code-adjustments.patch
zsmalloc-zram-introduce-zs_pool_stats-api.patch
zsmalloc-account-the-number-of-compacted-pages.patch
zsmalloc-use-shrinker-to-trigger-auto-compaction.patch
zsmalloc-partial-page-ordering-within-a-fullness_list.patch
zsmalloc-consider-zs_almost_full-as-migrate-source.patch
checkpatch-add-some-foo_destroy-functions-to-needless_if-tests.patch
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