linux-kernel - [PATCH] gfs2: Add check for mempool

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Message-Id: <20220311083616.2213689-1-jiasheng@iscas.ac.cn>
Date:   Fri, 11 Mar 2022 16:36:16 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     rpeterso@...hat.com, agruenba@...hat.com
Cc:     cluster-devel@...hat.com, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] gfs2: Add check for mempool_alloc

As the potential failure of mempool_alloc(),
it could return NULL pointer.
Therefore, it should be better to check it
in order to avoid the dereference of the NULL
pointer.

Fixes: e8c92ed76900 ("GFS2: Clean up log write code path")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 fs/gfs2/log.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index f0ee3ff6f9a8..10dd09e9b0e4 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -837,6 +837,9 @@ void gfs2_write_log_header(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd,
 		return;
 
 	page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
+	if (!page)
+		return;
+
 	lh = page_address(page);
 	clear_page(lh);
 
-- 
2.25.1