linux-ext4 - [PATCH 3/6] lib/support: check whether inump is null before accessing it in quota_set_sb

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Message-ID: <71ed1c9e-7e23-9f73-e7b9-55810963f4f3@huawei.com>
Date:   Fri, 3 Dec 2021 14:28:52 +0800
From:   zhanchengbin <zhanchengbin1@...wei.com>
To:     Theodore Ts'o <tytso@....edu>
CC:     <linux-ext4@...r.kernel.org>, <liuzhiqiang26@...wei.com>,
        <linfeilong@...wei.com>
Subject: [PATCH 3/6] lib/support: check whether inump is null before accessing
 it in quota_set_sb_inum()

In quota_set_sb_inum(), we should check whether inump is null before 
accessing it,
otherwise the null potinter dereference error may occur.

Signed-off-by: zhanchengbin <zhanchengbin1@...wei.com>
Signed-off-by: Zhiqiang Liu <liuzhiqiang26@...wei.com>
---
  lib/support/mkquota.c | 3 ++-
  1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/support/mkquota.c b/lib/support/mkquota.c
index 6f4a0b90..482e3d91 100644
--- a/lib/support/mkquota.c
+++ b/lib/support/mkquota.c
@@ -99,7 +99,8 @@ void quota_set_sb_inum(ext2_filsys fs, ext2_ino_t ino, 
enum quota_type qtype)

      log_debug("setting quota ino in superblock: ino=%u, type=%d", ino,
           qtype);
-    *inump = ino;
+    if (inump != NULL)
+        *inump = ino;
      ext2fs_mark_super_dirty(fs);
  }

-- 
2.23.0