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| author |   Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> | 2008-10-27 22:53:05 -0400 |
|---|---|---|
| committer |   Theodore Ts'o <tytso@mit.edu> | 2008-10-27 22:53:05 -0400 |
| commit | ef2cabf7c6d838eb0ee2b4fb8ef84f7c06ce16d9 (patch) | |
| tree | 64c3c14ae4a3717c6c193773d87e31f5facc569e /fs | |
| parent | ext3: fix a bug accessing freed memory in ext3_abort (diff) | |
| download | linux-dev-ef2cabf7c6d838eb0ee2b4fb8ef84f7c06ce16d9.tar.xz linux-dev-ef2cabf7c6d838eb0ee2b4fb8ef84f7c06ce16d9.zip | |
ext4: fix a bug accessing freed memory in ext4_abort
Vegard Nossum reported a bug which accesses freed memory (found via
kmemcheck). When journal has been aborted, ext4_put_super() calls
ext4_abort() after freeing the journal_t object, and then ext4_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')
| -rw-r--r-- | fs/ext4/super.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index bdddea14e782..994859df010e 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -333,7 +333,8 @@ void ext4_abort(struct super_block *sb, const char *function, EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; sb->s_flags |= MS_RDONLY; EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; - jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); + if (EXT4_SB(sb)->s_journal) + jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); } void ext4_warning(struct super_block *sb, const char *function, @@ -442,14 +443,16 @@ static void ext4_put_super(struct super_block *sb) { struct ext4_sb_info *sbi = EXT4_SB(sb); struct ext4_super_block *es = sbi->s_es; - int i; + int i, err; ext4_mb_release(sb); ext4_ext_release(sb); ext4_xattr_put_super(sb); - if (jbd2_journal_destroy(sbi->s_journal) < 0) - ext4_abort(sb, __func__, "Couldn't clean up the journal"); + err = jbd2_journal_destroy(sbi->s_journal); sbi->s_journal = NULL; + if (err < 0) + ext4_abort(sb, __func__, "Couldn't clean up the journal"); + if (!(sb->s_flags & MS_RDONLY)) { EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); es->s_state = cpu_to_le16(sbi->s_mount_state); |