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| author | Jann Horn <jannh@google.com> | 2019-01-12 04:39:05 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-12 21:45:00 +0300 |
| commit | 50449aafb818a55a012985d2412a34a4c624f7f2 (patch) | |
| tree | f7ce92717df8cfcebe5e980581d2cbe8e77f9927 /fs/fuse/dev.c | |
| parent | 18c071d41fda1e17a93aeb831e2f44d6c97ad02d (diff) | |
| download | linux-50449aafb818a55a012985d2412a34a4c624f7f2.tar.xz | |
fuse: call pipe_buf_release() under pipe lock
commit 9509941e9c534920ccc4771ae70bd6cbbe79df1c upstream.
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: dd3bb14f44a6 ("fuse: support splice() writing to fuse device")
Cc: stable@vger.kernel.org
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/fuse/dev.c')
| -rw-r--r-- | fs/fuse/dev.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index b4253181b5d4..ffcceb1bc20b 100644 --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -2018,8 +2018,10 @@ 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: kfree(bufs); |