linux-ext4 - [PATCH] tune2fs: fix tune2fs segfault when ext2fs_run_ext3

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Date:   Mon, 5 Sep 2022 19:16:03 +0800
From:   Zhiqiang Liu <liuzhiqiang26@...wei.com>
To:     "Theodore Y. Ts'o" <tytso@....edu>, <adilger@...mcloud.com>,
        "Ext4 Developers List" <linux-ext4@...r.kernel.org>,
        zhanchengbin <zhanchengbin1@...wei.com>
CC:     wuguanghao <wuguanghao3@...wei.com>,
        linfeilong <linfeilong@...wei.com>
Subject: [PATCH] tune2fs: fix tune2fs segfault when ext2fs_run_ext3_journal()
 fails


When ext2fs_run_ext3_journal() fails, tune2fs cmd will occur one
segfault problem as follows.
(gdb) bt
#0  0x00007fdadad69917 in ext2fs_mmp_stop (fs=0x0) at mmp.c:405
#1  0x0000558fa5a9365a in main (argc=<optimized out>, argv=<optimized out>) at tune2fs.c:3440

misc/tune2fs.c:
main()
  -> ext2fs_open2(&fs)
    -> ext2fs_mmp_start
  ......
  -> retval = ext2fs_run_ext3_journal(&fs)
  -> if (retval)
    // if ext2fs_run_ext3_journal fails, close and free fs.
    -> ext2fs_close_free(&fs)
    -> rc = 1
    -> goto closefs
  ......
closefs:
  -> if (rc)
    -> ext2fs_mmp_stop(fs)     // fs has been set to NULL, boom!!
  -> (ext2fs_close_free(&fs) ? 1 : 0); // close and free fs

In main() of tune2fs cmd, if ext2fs_run_ext3_journal() fails,
we should set rc=1 and goto closefs tag, in which will release fs
resource.

Fix: a2292f8a5108 ("tune2fs: reset MMP state on error exit")
Signed-off-by: Zhiqiang Liu <liuzhiqiang26@...wei.com>
Signed-off-by: zhanchengbin <zhanchengbin1@...wei.com>
---
 misc/tune2fs.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/misc/tune2fs.c b/misc/tune2fs.c
index 9f0d4379..25ade2fa 100644
--- a/misc/tune2fs.c
+++ b/misc/tune2fs.c
@@ -3344,8 +3344,6 @@ _("Warning: The journal is dirty. You may wish to replay the journal like:\n\n"
 			com_err("tune2fs", retval,
 				"while recovering journal.\n");
 			printf(_("Please run e2fsck -fy %s.\n"), argv[1]);
-			if (fs)
-				ext2fs_close_free(&fs);
 			rc = 1;
 			goto closefs;
 		}
-- 
2.33.0