linux-kernel - [PATCH v1] zsmalloc: zs_destroy_pool: add size

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Date:   Thu, 13 Oct 2022 14:28:25 +0300
From:   Alexey Romanov <avromanov@...rdevices.ru>
To:     <minchan@...nel.org>, <senozhatsky@...omium.org>,
        <ngupta@...are.org>, <akpm@...ux-foundation.org>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <kernel@...rdevices.ru>, Alexey Romanov <avromanov@...rdevices.ru>
Subject: [PATCH v1] zsmalloc: zs_destroy_pool: add size_class NULL check

Inside the zs_destroy_pool() function, there can still
be NULL size_class pointers: if when the next size_class is
allocated, inside zs_create_pool() function, kzalloc will
return NULL and handling the error condition, zs_create_pool()
will call zs_destroy_pool().

Fixes: f24263a5a076 ("zsmalloc: remove unnecessary size_class NULL check")
Signed-off-by: Alexey Romanov <avromanov@...rdevices.ru>
---
 mm/zsmalloc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 525758713a55..d03941cace2c 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -2311,6 +2311,9 @@ void zs_destroy_pool(struct zs_pool *pool)
 		int fg;
 		struct size_class *class = pool->size_class[i];
 
+		if (!class)
+			continue;
+
 		if (class->index != i)
 			continue;
 
-- 
2.25.1