linux-kernel - [PATCH 4/5] fs/ntfs3: Fixed overflow check in mi_enum

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Date: Mon, 29 Jan 2024 11:09:16 +0300
From: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
To: <ntfs3@...ts.linux.dev>
CC: <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>
Subject: [PATCH 4/5] fs/ntfs3: Fixed overflow check in mi_enum_attr()


Reported-by: Robert Morris <rtm@...il.mit.edu>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
---
  fs/ntfs3/record.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ntfs3/record.c b/fs/ntfs3/record.c
index 7b6423584eae..6aa3a9d44df1 100644
--- a/fs/ntfs3/record.c
+++ b/fs/ntfs3/record.c
@@ -279,7 +279,7 @@ struct ATTRIB *mi_enum_attr(struct mft_inode *mi, 
struct ATTRIB *attr)
          if (t16 > asize)
              return NULL;

-        if (t16 + le32_to_cpu(attr->res.data_size) > asize)
+        if (le32_to_cpu(attr->res.data_size) > asize - t16)
              return NULL;

          t32 = sizeof(short) * attr->name_len;
-- 
2.34.1