diff options
| author | Badari Pulavarty <pbadari@us.ibm.com> | 2007-08-10 13:00:44 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-08-15 09:25:10 -0700 |
| commit | 9c33865a93d1bfea6c21fd394f59a997ec17d72a (patch) | |
| tree | 8077040cee083a5afd62d370f1d537b08427cb35 | |
| parent | 51a718fdf27c4bf61936f146516b9f623b4e9875 (diff) | |
direct-io: fix error-path crashes
Need to initialize map_bh.b_state to zero. Otherwise, in case of a faulty
user-buffer its possible to go into dio_zero_block() and submit a page by
mistake - since it checks for buffer_new().
http://marc.info/?l=linux-kernel&m=118551339032528&w=2
akpm: Linus had a (better) patch to just do a kzalloc() in there, but it got
lost. Probably this version is better for -stable anwyay.
Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Acked-by: Joe Jin <joe.jin@oracle.com>
Acked-by: Zach Brown <zach.brown@oracle.com>
Cc: gurudas pai <gurudas.pai@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | fs/direct-io.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/direct-io.c b/fs/direct-io.c index 52bb2638f7a..6874785bb65 100644 --- a/fs/direct-io.c +++ b/fs/direct-io.c @@ -974,6 +974,7 @@ direct_io_worker(int rw, struct kiocb *iocb, struct inode *inode, dio->get_block = get_block; dio->end_io = end_io; dio->map_bh.b_private = NULL; + dio->map_bh.b_state = 0; dio->final_block_in_bio = -1; dio->next_block_for_io = -1; |