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| author | Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> | 2008-10-27 22:51:46 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2008-10-27 22:51:46 -0400 |
| commit | 44d6f78756560e95903de239e10f8a40a6eae444 (patch) | |
| tree | 2f4e1ec9219eb9f8e3d564856e5c40174bd869e7 /fs/ext3 | |
| parent | 0173a3265b228da319ceb9c1ec6a5682fd1b2d92 (diff) | |
| download | lwn-44d6f78756560e95903de239e10f8a40a6eae444.tar.gz lwn-44d6f78756560e95903de239e10f8a40a6eae444.zip | |
ext3: fix a bug accessing freed memory in ext3_abort
Vegard Nossum reported a bug which accesses freed memory (found via
kmemcheck). When journal has been aborted, ext3_put_super() calls
ext3_abort() after freeing the journal_t object, and then ext3_abort()
accesses it. This patch fix it.
Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>
Acked-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext3')
| -rw-r--r-- | fs/ext3/super.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/fs/ext3/super.c b/fs/ext3/super.c index 18eaa78ecb4e..e5717a4fae67 100644 --- a/fs/ext3/super.c +++ b/fs/ext3/super.c @@ -281,7 +281,8 @@ void ext3_abort (struct super_block * sb, const char * function, EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; sb->s_flags |= MS_RDONLY; EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT; - journal_abort(EXT3_SB(sb)->s_journal, -EIO); + if (EXT3_SB(sb)->s_journal) + journal_abort(EXT3_SB(sb)->s_journal, -EIO); } void ext3_warning (struct super_block * sb, const char * function, @@ -390,11 +391,14 @@ static void ext3_put_super (struct super_block * sb) { struct ext3_sb_info *sbi = EXT3_SB(sb); struct ext3_super_block *es = sbi->s_es; - int i; + int i, err; ext3_xattr_put_super(sb); - if (journal_destroy(sbi->s_journal) < 0) + err = journal_destroy(sbi->s_journal); + sbi->s_journal = NULL; + if (err < 0) ext3_abort(sb, __func__, "Couldn't clean up the journal"); + if (!(sb->s_flags & MS_RDONLY)) { EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); es->s_state = cpu_to_le16(sbi->s_mount_state); |