linux-kernel - [PATCH] io_uring/net: fix build warning for !CONFIG

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Message-Id: <20250227132018.1111094-1-arnd@kernel.org>
Date: Thu, 27 Feb 2025 14:20:09 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: Jens Axboe <axboe@...nel.dk>,
	Pavel Begunkov <asml.silence@...il.com>
Cc: Arnd Bergmann <arnd@...db.de>,
	Gabriel Krisman Bertazi <krisman@...e.de>,
	David Wei <dw@...idwei.uk>,
	io-uring@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] io_uring/net: fix build warning for !CONFIG_COMPAT

From: Arnd Bergmann <arnd@...db.de>

A code rework resulted in an uninitialized return code when COMPAT
mode is disabled:

io_uring/net.c:722:6: error: variable 'ret' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
  722 |         if (io_is_compat(req->ctx)) {
      |             ^~~~~~~~~~~~~~~~~~~~~~
io_uring/net.c:736:15: note: uninitialized use occurs here
  736 |         if (unlikely(ret))
      |                      ^~~

Since io_is_compat() turns into a compile-time 'false', the #ifdef
here is completely unnecessary, and removing it avoids the warning.

Fixes: 685252678757 ("io_uring/net: unify *mshot_prep calls with compat")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 io_uring/net.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/io_uring/net.c b/io_uring/net.c
index bb454b9f6a4c..33e9be094131 100644
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -224,7 +224,6 @@ static int io_net_import_vec(struct io_kiocb *req, struct io_async_msghdr *iomsg
 	return 0;
 }
 
-#ifdef CONFIG_COMPAT
 static int io_compat_msg_copy_hdr(struct io_kiocb *req,
 				  struct io_async_msghdr *iomsg,
 				  struct compat_msghdr *msg, int ddir,
@@ -263,7 +262,6 @@ static int io_compat_msg_copy_hdr(struct io_kiocb *req,
 	return io_net_import_vec(req, iomsg, (struct iovec __user *)uiov,
 				 msg->msg_iovlen, ddir);
 }
-#endif
 
 static int io_copy_msghdr_from_user(struct user_msghdr *msg,
 				    struct user_msghdr __user *umsg)
@@ -330,7 +328,6 @@ static int io_sendmsg_copy_hdr(struct io_kiocb *req,
 	iomsg->msg.msg_name = &iomsg->addr;
 	iomsg->msg.msg_iter.nr_segs = 0;
 
-#ifdef CONFIG_COMPAT
 	if (io_is_compat(req->ctx)) {
 		struct compat_msghdr cmsg;
 
@@ -339,7 +336,6 @@ static int io_sendmsg_copy_hdr(struct io_kiocb *req,
 		sr->msg_control = iomsg->msg.msg_control_user;
 		return ret;
 	}
-#endif
 
 	ret = io_msg_copy_hdr(req, iomsg, &msg, ITER_SOURCE, NULL);
 	/* save msg_control as sys_sendmsg() overwrites it */
@@ -720,7 +716,6 @@ static int io_recvmsg_copy_hdr(struct io_kiocb *req,
 	iomsg->msg.msg_iter.nr_segs = 0;
 
 	if (io_is_compat(req->ctx)) {
-#ifdef CONFIG_COMPAT
 		struct compat_msghdr cmsg;
 
 		ret = io_compat_msg_copy_hdr(req, iomsg, &cmsg, ITER_DEST,
@@ -728,7 +723,6 @@ static int io_recvmsg_copy_hdr(struct io_kiocb *req,
 		memset(&msg, 0, sizeof(msg));
 		msg.msg_namelen = cmsg.msg_namelen;
 		msg.msg_controllen = cmsg.msg_controllen;
-#endif
 	} else {
 		ret = io_msg_copy_hdr(req, iomsg, &msg, ITER_DEST, &iomsg->uaddr);
 	}
-- 
2.39.5