From: Alexey Romanov <avromanov@sberdevices.ru>
Date: Thu, 13 Oct 2022 11:28:25 +0000 (+0300)
Subject: zsmalloc: zs_destroy_pool: add size_class NULL check
X-Git-Tag: baikal/aarch64/sdk6.1~2798^2~13
X-Git-Url: https://git.baikalelectronics.ru/sdk/?a=commitdiff_plain;h=21d62ea445cb4f075306fc2d60b76c53f15e8cc0;p=kernel.git

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().

Link: https://lkml.kernel.org/r/20221013112825.61869-1-avromanov@sberdevices.ru
Fixes: b448e4f972cc ("zsmalloc: remove unnecessary size_class NULL check")
Signed-off-by: Alexey Romanov <avromanov@sberdevices.ru>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 525758713a553..d03941cace2c4 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;