dma-pool: Fix an uninitialized variable bug in atomic_pool_expand()

Dan Carpenter · Christoph Hellwig · commit 892fc9f6835e · 2020-08-27T09:22:56.000+02:00
The "page" pointer can be used with out being initialized. Fixes: d7e673e ("dma-pool: Only allocate from CMA when in same memory zone") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
@@ -84,7 +84,7 @@ static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size,
 			      gfp_t gfp)
 {
 	unsigned int order;
-	struct page *page;
+	struct page *page = NULL;
 	void *addr;
 	int ret = -ENOMEM;
 

Original file line number	Diff line number	Diff line change
`@@ -84,7 +84,7 @@ static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size,`
`84`	`84`	`gfp_t gfp)`
`85`	`85`	`{`
`86`	`86`	`unsigned int order;`
`87`		`- struct page *page;`
	`87`	`+ struct page *page = NULL;`
`88`	`88`	`void *addr;`
`89`	`89`	`int ret = -ENOMEM;`
`90`	`90`