4.4-stable review patch. If anyone has any objections, please let me know.
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From: Miklos Szeredi mszeredi@redhat.com
commit 87114373ea507895a62afb10d2910bd9adac35a8 upstream.
Refcounting of request is broken when fuse_abort_conn() is called and request is on the fpq->io list:
- ref is taken too late - then it is not dropped
Fixes: 0d8e84b0432b ("fuse: simplify request abort") Cc: stable@vger.kernel.org # v4.2 Signed-off-by: Miklos Szeredi mszeredi@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/fuse/dev.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
--- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -382,7 +382,7 @@ static void request_end(struct fuse_conn struct fuse_iqueue *fiq = &fc->iq;
if (test_and_set_bit(FR_FINISHED, &req->flags)) - return; + goto out_put_req;
spin_lock(&fiq->waitq.lock); list_del_init(&req->intr_entry); @@ -412,6 +412,7 @@ static void request_end(struct fuse_conn wake_up(&req->waitq); if (req->end) req->end(fc, req); +out_put_req: fuse_put_request(fc, req); }
@@ -2154,6 +2155,7 @@ void fuse_abort_conn(struct fuse_conn *f set_bit(FR_ABORTED, &req->flags); if (!test_bit(FR_LOCKED, &req->flags)) { set_bit(FR_PRIVATE, &req->flags); + __fuse_get_request(req); list_move(&req->list, &to_end1); } spin_unlock(&req->waitq.lock); @@ -2180,7 +2182,6 @@ void fuse_abort_conn(struct fuse_conn *f
while (!list_empty(&to_end1)) { req = list_first_entry(&to_end1, struct fuse_req, list); - __fuse_get_request(req); list_del_init(&req->list); request_end(fc, req); }