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authorJens Axboe <axboe@kernel.dk>2019-07-25 18:20:18 +0200
committerJens Axboe <axboe@kernel.dk>2019-07-25 18:20:18 +0200
commit36703247d5f52a679df9da51192b6950fe81689f (patch)
treebad2dab2f508c0e23acfff04cad9389a9209a21e /fs/io_uring.c
parentdrbd: dynamically allocate shash descriptor (diff)
downloadlinux-36703247d5f52a679df9da51192b6950fe81689f.tar.xz
linux-36703247d5f52a679df9da51192b6950fe81689f.zip
io_uring: ensure ->list is initialized for poll commands
Daniel reports that when testing an http server that uses io_uring to poll for incoming connections, sometimes it hard crashes. This is due to an uninitialized list member for the io_uring request. Normally this doesn't trigger and none of the test cases caught it. Reported-by: Daniel Kozak <kozzi11@gmail.com> Tested-by: Daniel Kozak <kozzi11@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/io_uring.c')
-rw-r--r--fs/io_uring.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 2039f888197e..15d9b16ed29d 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1666,6 +1666,8 @@ static int io_poll_add(struct io_kiocb *req, const struct io_uring_sqe *sqe)
INIT_LIST_HEAD(&poll->wait.entry);
init_waitqueue_func_entry(&poll->wait, io_poll_wake);
+ INIT_LIST_HEAD(&req->list);
+
mask = vfs_poll(poll->file, &ipt.pt) & poll->events;
spin_lock_irq(&ctx->completion_lock);