fuse: fix stack use after return

Normal, synchronous requests will have their args allocated on the stack.
After the FR_FINISHED bit is set by receiving the reply from the userspace
fuse server, the originating task may return and reuse the stack frame,
resulting in an Oops if the args structure is dereferenced.

Fix by setting a flag in the request itself upon initializing, indicating
whether it has an asynchronous ->end() callback.

Reported-by: Kyle Sanderson <[email protected]>
Reported-by: Michael Stapelberg <[email protected]>
Fixes: 2b319d1f6f92 ("fuse: don't dereference req->args on finished request")
Cc: <[email protected]> # v5.4
Tested-by: Michael Stapelberg <[email protected]>
Signed-off-by: Miklos Szeredi <[email protected]>

0 files changed, 0 insertions, 0 deletions