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| author |   Jan Kara <jack@suse.cz> | 2010-10-19 00:24:21 +0200 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2010-10-28 01:30:06 +0200 |
| commit | 4408ea41c0ab4b711d4da44dd954fb06dce6c3f8 (patch) | |
| tree | 7244e8448303b034e17ab24a835012ae99b33734 /fs/quota | |
| parent | ext3: Update kernel-doc comments (diff) | |
| download | linux-dev-4408ea41c0ab4b711d4da44dd954fb06dce6c3f8.tar.xz linux-dev-4408ea41c0ab4b711d4da44dd954fb06dce6c3f8.zip | |
quota: Fix possible oops in __dquot_initialize()
When quotaon(8) races with __dquot_initialize() or dqget() fails because
of EIO, ENOSPC, or similar error, we could possibly dereference NULL pointer
in inode->i_dquot[cnt]. Add proper checking.
Reported-by: Dmitry Monakhov <dmonakhov@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/quota')
| -rw-r--r-- | fs/quota/dquot.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c index 1bc38f56fa7c..0fed41e6efcd 100644 --- a/fs/quota/dquot.c +++ b/fs/quota/dquot.c @@ -1386,6 +1386,9 @@ static void __dquot_initialize(struct inode *inode, int type) /* Avoid races with quotaoff() */ if (!sb_has_quota_active(sb, cnt)) continue; + /* We could race with quotaon or dqget() could have failed */ + if (!got[cnt]) + continue; if (!inode->i_dquot[cnt]) { inode->i_dquot[cnt] = got[cnt]; got[cnt] = NULL; |