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Commit 9509941e authored by Jann Horn's avatar Jann Horn Committed by Miklos Szeredi
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fuse: call pipe_buf_release() under pipe lock 



Some of the pipe_buf_release() handlers seem to assume that the pipe is
locked - in particular, anon_pipe_buf_release() accesses pipe->tmp_page
without taking any extra locks. From a glance through the callers of
pipe_buf_release(), it looks like FUSE is the only one that calls
pipe_buf_release() without having the pipe locked.

This bug should only lead to a memory leak, nothing terrible.

Fixes: dd3bb14f ("fuse: support splice() writing to fuse device")
Cc: stable@vger.kernel.org
Signed-off-by: default avatarJann Horn <jannh@google.com>
Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
parent 8a3177db

fs/fuse/dev.c

+2 −0
Original line number Diff line number Diff line
@@ -2077,8 +2077,10 @@ static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe, 


	ret = fuse_dev_do_write(fud, &cs, len);



	pipe_lock(pipe);

	for (idx = 0; idx < nbuf; idx++)

		pipe_buf_release(pipe, &bufs[idx]);

	pipe_unlock(pipe);



out:

	kvfree(bufs);