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/[email protected] Fixes: f24263a ("zsmalloc: remove unnecessary size_class NULL check") Signed-off-by: Alexey Romanov <[email protected]> Reviewed-by: Sergey Senozhatsky <[email protected]> Cc: Minchan Kim <[email protected]> Cc: Nitin Gupta <[email protected]> Signed-off-by: Andrew Morton <[email protected]>
niw · Oct 21, 2022 · 4249a05 · 4249a05
1 parent 7329e3e
commit 4249a05
Showing 1 changed file with 3 additions and 0 deletions.
diff --git 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;