David Howells dhowells@redhat.com writes:
If all the subrequests in an unbuffered write stream fail, the subrequest collector doesn't update the stream->transferred value and it retains its initial LONG_MAX value. Unfortunately, if all active streams fail, then we take the smallest value of { LONG_MAX, LONG_MAX, ... } as the value to set in wreq->transferred - which is then returned from ->write_iter().
LONG_MAX was chosen as the initial value so that all the streams can be quickly assessed by taking the smallest value of all stream->transferred - but this only works if we've set any of them.
Fix this by adding a flag to indicate whether the value in stream->transferred is valid and checking that when we integrate the values. stream->transferred can then be initialised to zero.
This was found by running the generic/750 xfstest against cifs with cache=none. It splices data to the target file. Once (if) it has used up all the available scratch space, the writes start failing with ENOSPC. This causes ->write_iter() to fail. However, it was returning wreq->transferred, i.e. LONG_MAX, rather than an error (because it thought the amount transferred was non-zero) and iter_file_splice_write() would then try to clean up that amount of pipe bufferage - leading to an oops when it overran. The kernel log showed:
CIFS: VFS: Send error in write = -28
followed by:
BUG: kernel NULL pointer dereference, address: 0000000000000008
with:
RIP: 0010:iter_file_splice_write+0x3a4/0x520 do_splice+0x197/0x4e0
or:
RIP: 0010:pipe_buf_release (include/linux/pipe_fs_i.h:282) iter_file_splice_write (fs/splice.c:755)
Also put a warning check into splice to announce if ->write_iter() returned that it had written more than it was asked to.
Fixes: 288ace2f57c9 ("netfs: New writeback implementation") Reported-by: Xiaoli Feng fengxiaoli0714@gmail.com Closes: https://bugzilla.kernel.org/show_bug.cgi?id=220445 Signed-off-by: David Howells dhowells@redhat.com cc: Paulo Alcantara pc@manguebit.org cc: Steve French sfrench@samba.org cc: Shyam Prasad N sprasad@microsoft.com cc: netfs@lists.linux.dev cc: linux-cifs@vger.kernel.org cc: linux-fsdevel@vger.kernel.org cc: stable@vger.kernel.org
fs/netfs/read_collect.c | 4 +++- fs/netfs/write_collect.c | 10 ++++++++-- fs/netfs/write_issue.c | 4 ++-- fs/splice.c | 3 +++ include/linux/netfs.h | 1 + 5 files changed, 17 insertions(+), 5 deletions(-)
Reviewed-by: Paulo Alcantara (Red Hat) pc@manguebit.org