From 303cc749c8659d5f1ccf97973591313ec0bdacd3 Mon Sep 17 00:00:00 2001 From: Eugene Syromiatnikov Date: Fri, 29 Apr 2022 16:22:18 +0200 Subject: [PATCH] io_uring: check that data field is 0 in ringfd unregister Only allow data field to be 0 in struct io_uring_rsrc_update user arguments to allow for future possible usage. Fixes: e7a6c00dc77a ("io_uring: add support for registering ring file descriptors") Signed-off-by: Eugene Syromiatnikov Link: https://lore.kernel.org/r/20220429142218.GA28696@asgard.redhat.com Signed-off-by: Jens Axboe --- fs/io_uring.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index e3ae26ff5d1a..e01f595f5b7d 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -10593,7 +10593,7 @@ static int io_ringfd_unregister(struct io_ring_ctx *ctx, void __user *__arg, ret = -EFAULT; break; } - if (reg.resv || reg.offset >= IO_RINGFD_REG_MAX) { + if (reg.resv || reg.data || reg.offset >= IO_RINGFD_REG_MAX) { ret = -EINVAL; break; }