linux-kernel - [PATCH 1/2] fs/ntfs3: Avoid possible NULL dereference

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Date:   Mon, 25 Sep 2023 12:48:06 +0800
From:   Su Hui <suhui@...china.com>
To:     almaz.alexandrovich@...agon-software.com
Cc:     Su Hui <suhui@...china.com>, ntfs3@...ts.linux.dev,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 1/2] fs/ntfs3: Avoid possible NULL dereference

smatch error:
fs/ntfs3/attrib.c:1826 attr_allocate_frame() error:
we previously assumed 'attr_b' could be null (see line 1739)

Return error code directly if 'attr_b' is NULL.

Signed-off-by: Su Hui <suhui@...china.com>
---
 fs/ntfs3/attrib.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/ntfs3/attrib.c b/fs/ntfs3/attrib.c
index a9d82bbb4729..ebc934ac5cf5 100644
--- a/fs/ntfs3/attrib.c
+++ b/fs/ntfs3/attrib.c
@@ -1737,8 +1737,7 @@ int attr_allocate_frame(struct ntfs_inode *ni, CLST frame, size_t compr_size,
 			attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL,
 					      0, NULL, &mi_b);
 			if (!attr_b) {
-				err = -ENOENT;
-				goto out;
+				return -ENOENT;
 			}
 
 			attr = attr_b;
-- 
2.30.2