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| author |   Miklos Szeredi <mszeredi@redhat.com> | 2018-07-26 16:13:11 +0200 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2018-07-26 16:13:11 +0200 |
| commit | 45ff350bbd9d0f0977ff270a0d427c71520c0c37 (patch) | |
| tree | cb331af1112ab98d9d43ec345718899a642c82ee /fs/fuse | |
| parent | fuse: fix double request_end() (diff) | |
| download | linux-dev-45ff350bbd9d0f0977ff270a0d427c71520c0c37.tar.xz linux-dev-45ff350bbd9d0f0977ff270a0d427c71520c0c37.zip | |
fuse: fix unlocked access to processing queue
fuse_dev_release() assumes that it's the only one referencing the
fpq->processing list, but that's not true, since fuse_abort_conn() can be
doing the same without any serialization between the two.
Fixes: c3696046beb3 ("fuse: separate pqueue for clones")
Cc: <stable@vger.kernel.org> # v4.2
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/fuse')
| -rw-r--r-- | fs/fuse/dev.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index 8564d91c7d41..c8b197e4af9a 100644 --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -2150,9 +2150,15 @@ int fuse_dev_release(struct inode *inode, struct file *file) if (fud) { struct fuse_conn *fc = fud->fc; struct fuse_pqueue *fpq = &fud->pq; + LIST_HEAD(to_end); + spin_lock(&fpq->lock); WARN_ON(!list_empty(&fpq->io)); - end_requests(fc, &fpq->processing); + list_splice_init(&fpq->processing, &to_end); + spin_unlock(&fpq->lock); + + end_requests(fc, &to_end); + /* Are we the last open device? */ if (atomic_dec_and_test(&fc->dev_count)) { WARN_ON(fc->iq.fasync != NULL); |