linux-kernel - [PATCH] fs/ntfs3: Add check for kmemdup

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Message-Id: <20221123084846.2703-1-jiasheng@iscas.ac.cn>
Date:   Wed, 23 Nov 2022 16:48:46 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     almaz.alexandrovich@...agon-software.com, nathan@...nel.org,
        ndesaulniers@...gle.com, trix@...hat.com
Cc:     ntfs3@...ts.linux.dev, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] fs/ntfs3: Add check for kmemdup

Since the kmemdup may return NULL pointer,
it should be better to add check for the return value
in order to avoid NULL pointer dereference.

Fixes: b46acd6a6a62 ("fs/ntfs3: Add NTFS journal")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 fs/ntfs3/fslog.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/ntfs3/fslog.c b/fs/ntfs3/fslog.c
index 0d611a6c5511..eb7cf8a69607 100644
--- a/fs/ntfs3/fslog.c
+++ b/fs/ntfs3/fslog.c
@@ -4277,6 +4277,10 @@ int log_replay(struct ntfs_inode *ni, bool *initialized)
 	rec_len -= t32;
 
 	attr_names = kmemdup(Add2Ptr(lrh, t32), rec_len, GFP_NOFS);
+	if (!attr_names) {
+		err = -ENOMEM;
+		goto out;
+	}
 
 	lcb_put(lcb);
 	lcb = NULL;
-- 
2.25.1