diff options
| author | Robert Doebbelin <robert@quobyte.com> | 2016-03-07 09:50:56 +0100 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-04-18 08:50:56 -0400 |
| commit | 19167d65fabb60ff11fc5f9c4a5248c17a12f615 (patch) | |
| tree | a9d169eb35b8361d3420634ed674c5558189024d /fs | |
| parent | f9162af6d940378c5fc24ec379f13a63edd15308 (diff) | |
fuse: do not use iocb after it may have been freed
[ Upstream commit 7cabc61e01a0a8b663bd2b4c982aa53048218734 ]
There's a race in fuse_direct_IO(), whereby is_sync_kiocb() is called on an
iocb that could have been freed if async io has already completed. The fix
in this case is simple and obvious: cache the result before starting io.
It was discovered by KASan:
kernel: ==================================================================
kernel: BUG: KASan: use after free in fuse_direct_IO+0xb1a/0xcc0 at addr ffff88036c414390
Signed-off-by: Robert Doebbelin <robert@quobyte.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Fixes: bcba24ccdc82 ("fuse: enable asynchronous processing direct IO")
Cc: <stable@vger.kernel.org> # 3.10+
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/fuse/file.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 82f69a645a54..2020a3fdbdaf 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -2786,6 +2786,7 @@ fuse_direct_IO(struct kiocb *iocb, struct iov_iter *iter, loff_t offset) loff_t i_size; size_t count = iov_iter_count(iter); struct fuse_io_priv *io; + bool is_sync = is_sync_kiocb(iocb); pos = offset; inode = file->f_mapping->host; @@ -2825,11 +2826,11 @@ fuse_direct_IO(struct kiocb *iocb, struct iov_iter *iter, loff_t offset) * to wait on real async I/O requests, so we must submit this request * synchronously. */ - if (!is_sync_kiocb(iocb) && (offset + count > i_size) && + if (!is_sync && (offset + count > i_size) && iov_iter_rw(iter) == WRITE) io->async = false; - if (io->async && is_sync_kiocb(iocb)) + if (io->async && is_sync) io->done = &wait; if (iov_iter_rw(iter) == WRITE) { @@ -2843,7 +2844,7 @@ fuse_direct_IO(struct kiocb *iocb, struct iov_iter *iter, loff_t offset) fuse_aio_complete(io, ret < 0 ? ret : 0, -1); /* we have a non-extending, async request, so return */ - if (!is_sync_kiocb(iocb)) + if (!is_sync) return -EIOCBQUEUED; wait_for_completion(&wait); |