linux-kernel - [PATCH] NFSv4/pnfs: minor fix for cleanup path in nfs4_get_device

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Message-ID: <20230720153753.20497-1-pchelkin@ispras.ru>
Date:   Thu, 20 Jul 2023 18:37:51 +0300
From:   Fedor Pchelkin <pchelkin@...ras.ru>
To:     Trond Myklebust <trond.myklebust@...merspace.com>
Cc:     Fedor Pchelkin <pchelkin@...ras.ru>,
        Anna Schumaker <anna@...nel.org>, linux-nfs@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Alexey Khoroshilov <khoroshilov@...ras.ru>,
        lvc-project@...uxtesting.org, stable@...r.kernel.org
Subject: [PATCH] NFSv4/pnfs: minor fix for cleanup path in nfs4_get_device_info

It is an almost improbable error case but when page allocating loop in
nfs4_get_device_info() fails then we should only free the already
allocated pages, as __free_page() can't deal with NULL arguments.

Found by Linux Verification Center (linuxtesting.org).

Cc: stable@...r.kernel.org
Signed-off-by: Fedor Pchelkin <pchelkin@...ras.ru>
---
 fs/nfs/pnfs_dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nfs/pnfs_dev.c b/fs/nfs/pnfs_dev.c
index ddbbf4fcda86..178001c90156 100644
--- a/fs/nfs/pnfs_dev.c
+++ b/fs/nfs/pnfs_dev.c
@@ -154,7 +154,7 @@ nfs4_get_device_info(struct nfs_server *server,
 		set_bit(NFS_DEVICEID_NOCACHE, &d->flags);
 
 out_free_pages:
-	for (i = 0; i < max_pages; i++)
+	while (--i >= 0)
 		__free_page(pages[i]);
 	kfree(pages);
 out_free_pdev:
-- 
2.41.0