linux-kernel - [PATCH AUTOSEL 5.15 06/28] fs/ntfs3: Fix possible NULL-ptr-deref in ni_readpage

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Message-ID: <20231029225916.791798-6-sashal@kernel.org>
Date:   Sun, 29 Oct 2023 18:58:41 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
        Sasha Levin <sashal@...nel.org>, ntfs3@...ts.linux.dev
Subject: [PATCH AUTOSEL 5.15 06/28] fs/ntfs3: Fix possible NULL-ptr-deref in ni_readpage_cmpr()

From: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>

[ Upstream commit 32e9212256b88f35466642f9c939bb40cfb2c2de ]

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/ntfs3/frecord.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ntfs3/frecord.c b/fs/ntfs3/frecord.c
index 73a56d7ac84b7..b02778cbb1d34 100644
--- a/fs/ntfs3/frecord.c
+++ b/fs/ntfs3/frecord.c
@@ -2100,7 +2100,7 @@ int ni_readpage_cmpr(struct ntfs_inode *ni, struct page *page)
 
 	for (i = 0; i < pages_per_frame; i++) {
 		pg = pages[i];
-		if (i == idx)
+		if (i == idx || !pg)
 			continue;
 		unlock_page(pg);
 		put_page(pg);
-- 
2.42.0