netdev - [net RFC v1 1/1] page_pool: fix NULL dereference crash

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Date:   Fri, 21 Jan 2022 16:56:44 -0800
From:   Colin Foster <colin.foster@...advantage.com>
To:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc:     Toke Høiland-Jørgensen <toke@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>
Subject: [net RFC v1 1/1] page_pool: fix NULL dereference crash

Check for the existence of page pool params before dereferencing. This can
cause crashes in certain conditions.

Fixes: 35b2e549894b ("page_pool: Add callback to init pages when they are
allocated")

Signed-off-by: Colin Foster <colin.foster@...advantage.com>
---
 net/core/page_pool.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index bd62c01a2ec3..641f849c95e7 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -213,7 +213,7 @@ static void page_pool_set_pp_info(struct page_pool *pool,
 {
 	page->pp = pool;
 	page->pp_magic |= PP_SIGNATURE;
-	if (pool->p.init_callback)
+	if (pool->p && pool->p.init_callback)
 		pool->p.init_callback(page, pool->p.init_arg);
 }
 
-- 
2.25.1