For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com.

***

Subject: io_uring/cmd: don't skip completion for a non-armed multishot uring_cmd
Author: vasilisalmpanis@gmail.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git dad19b6f6336e1587b0f767d5b4e2b5543224b43

diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c
index c14c22cff49e..a2899a852879 100644
--- a/io_uring/uring_cmd.c
+++ b/io_uring/uring_cmd.c
@@ -269,7 +269,8 @@ int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
 	}
 
 	ret = file->f_op->uring_cmd(ioucmd, issue_flags);
-	if (ioucmd->flags & IORING_URING_CMD_MULTISHOT) {
+	if ((ioucmd->flags & IORING_URING_CMD_MULTISHOT) &&
+	    (req->flags & REQ_F_APOLL_MULTISHOT)) {
 		if (ret >= 0)
 			return IOU_ISSUE_SKIP_COMPLETE;
 	}