io_uring: fix memory leak of UNIX domain socket inode
Opening and closing an io_uring instance leaks a UNIX domain socket inode. This is because the ->file of the io_uring instance's internal UNIX domain socket is set to point to the io_uring file, but then sock_release() sees the non-NULL ->file and assumes the inode reference is held by the file so doesn't call iput(). That's not the case here, since the reference is still meant to be held by the socket; the actual inode of the io_uring file is different. Fix this leak by NULL-ing out ->file before releasing the socket. Reported-by:<syzbot+111cb28d9f583693aefa@syzkaller.appspotmail.com> Fixes: 2b188cc1 ("Add io_uring IO interface") Cc: <stable@vger.kernel.org> # v5.1+ Signed-off-by:
Eric Biggers <ebiggers@google.com> Signed-off-by:
Jens Axboe <axboe@kernel.dk>
parent
b9aef63a
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