[PATCH 4.9 03/22] fuse: fix use after free issue in fuse_dev_do_read()

From: Greg Kroah-Hartman
Date: Tue Feb 21 2017 - 08:04:21 EST

4.9-stable review patch. If anyone has any objections, please let me know.


From: Sahitya Tummala <stummala@xxxxxxxxxxxxxx>

commit 6ba4d2722d06960102c981322035239cd66f7316 upstream.

There is a potential race between fuse_dev_do_write()
and request_wait_answer() contexts as shown below:

|--if (test_bit(FR_SENT, &req->flags))
<gets pre-empted after it is validated true>
|--clears bit FR_SENT,
|--sets bit FR_FINISHED
<request gets queued to interrupts list>
<as FR_FINISHED is set, it returns and then
the caller frees this request>

Now, the next fuse_dev_do_read(), see interrupts list is not empty
and then calls fuse_read_interrupt() which tries to access the request
which is already free'd and gets the below crash:

[11432.401266] Unable to handle kernel paging request at virtual address
[11432.418518] Kernel BUG at ffffff80083720e0
[11432.456168] PC is at __list_del_entry+0x6c/0xc4
[11432.463573] LR is at fuse_dev_do_read+0x1ac/0x474
[11432.679999] [<ffffff80083720e0>] __list_del_entry+0x6c/0xc4
[11432.687794] [<ffffff80082c65e0>] fuse_dev_do_read+0x1ac/0x474
[11432.693180] [<ffffff80082c6b14>] fuse_dev_read+0x6c/0x78
[11432.699082] [<ffffff80081d5638>] __vfs_read+0xc0/0xe8
[11432.704459] [<ffffff80081d5efc>] vfs_read+0x90/0x108
[11432.709406] [<ffffff80081d67f0>] SyS_read+0x58/0x94

As FR_FINISHED bit is set before deleting the intr_entry with input
queue lock in request completion path, do the testing of this flag and
queueing atomically with the same lock in queue_interrupt().

Signed-off-by: Sahitya Tummala <stummala@xxxxxxxxxxxxxx>
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
Fixes: fd22d62ed0c3 ("fuse: no fc->lock for iqueue parts")
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

fs/fuse/dev.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -399,6 +399,10 @@ static void request_end(struct fuse_conn
static void queue_interrupt(struct fuse_iqueue *fiq, struct fuse_req *req)
+ if (test_bit(FR_FINISHED, &req->flags)) {
+ spin_unlock(&fiq->waitq.lock);
+ return;
+ }
if (list_empty(&req->intr_entry)) {
list_add_tail(&req->intr_entry, &fiq->interrupts);