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ext4: fix a bug accessing freed memory in ext4_abort

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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>
This commit is contained in:
Hidehiro Kawai 2008-10-27 22:53:05 -04:00 committed by Theodore Ts'o
parent 44d6f78756
commit ef2cabf7c6
1 changed files with 7 additions and 4 deletions
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11
fs/ext4/super.c
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@ -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);