linux-ext4 - [PATCH] tune2fs: prevent crash if error in journal recovery

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Date:   Thu, 05 Oct 2017 08:25:50 +0300
From:   eru@...ti.fi
To:     linux-ext4@...r.kernel.org
Subject: [PATCH] tune2fs: prevent crash if error in journal recovery

Prevent coredump if tunefs calls ext2fs_run_ext3_journal(), and this 
then
fails for some reason while calling ext2fs_open2(). Such failure makes
the fs pointer NULL.

Signed-off-by: Erkki Ruohtula <eru@...ti.fi>
---

diff --git a/misc/tune2fs.c b/misc/tune2fs.c
index ecba2ea..6538032 100644
--- a/misc/tune2fs.c
+++ b/misc/tune2fs.c
@@ -3367,6 +3367,9 @@ closefs:
  #endif
  	}

-	convert_64bit(fs, feature_64bit);
-	return (ext2fs_close_free(&fs) ? 1 : 0);
+	if (fs) {
+		convert_64bit(fs, feature_64bit);
+		return (ext2fs_close_free(&fs) ? 1 : 0);
+	}
+	return 1;
  }