diff options
| author | Miklos Szeredi <mszeredi@redhat.com> | 2018-07-26 16:13:11 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-05 09:20:08 +0200 |
| commit | 501c4caeb3e437eb18bb95b2c58d153aadc70d6e (patch) | |
| tree | af184b52ba4bc1d8f9fccee5c0a98381798471bb | |
| parent | 68fbfcb7cd4375889bb000d181dcf46aa45d06a9 (diff) | |
fuse: fix double request_end()
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>
| -rw-r--r-- | fs/fuse/dev.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index ce558c853722..9382ba430be5 100644 --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -363,7 +363,7 @@ static void request_end(struct fuse_conn *fc, struct fuse_req *req) 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); @@ -393,6 +393,7 @@ static void request_end(struct fuse_conn *fc, struct fuse_req *req) wake_up(&req->waitq); if (req->end) req->end(fc, req); +out_put_req: fuse_put_request(fc, req); } @@ -2097,6 +2098,7 @@ void fuse_abort_conn(struct fuse_conn *fc) 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); @@ -2123,7 +2125,6 @@ void fuse_abort_conn(struct fuse_conn *fc) 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); } |