linux-kernel - [PATCH AUTOSEL 6.5 15/37] kernel: watch

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Date:   Tue,  7 Nov 2023 07:21:26 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Philipp Stanner <pstanner@...hat.com>,
        David Airlie <airlied@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Zack Rusin <zackr@...are.com>, Sasha Levin <sashal@...nel.org>,
        brauner@...nel.org, ddiss@...e.de, nick.alcock@...cle.com,
        dhowells@...hat.com, code@...dh.me
Subject: [PATCH AUTOSEL 6.5 15/37] kernel: watch_queue: copy user-array safely

From: Philipp Stanner <pstanner@...hat.com>

[ Upstream commit ca0776571d3163bd03b3e8c9e3da936abfaecbf6 ]

Currently, there is no overflow-check with memdup_user().

Use the new function memdup_array_user() instead of memdup_user() for
duplicating the user-space array safely.

Suggested-by: David Airlie <airlied@...hat.com>
Signed-off-by: Philipp Stanner <pstanner@...hat.com>
Reviewed-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Zack Rusin <zackr@...are.com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230920123612.16914-5-pstanner@redhat.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 kernel/watch_queue.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/watch_queue.c b/kernel/watch_queue.c
index d0b6b390ee423..778b4056700ff 100644
--- a/kernel/watch_queue.c
+++ b/kernel/watch_queue.c
@@ -331,7 +331,7 @@ long watch_queue_set_filter(struct pipe_inode_info *pipe,
 	    filter.__reserved != 0)
 		return -EINVAL;
 
-	tf = memdup_user(_filter->filters, filter.nr_filters * sizeof(*tf));
+	tf = memdup_array_user(_filter->filters, filter.nr_filters, sizeof(*tf));
 	if (IS_ERR(tf))
 		return PTR_ERR(tf);
 
-- 
2.42.0