From: Philipp Stanner <pstanner@xxxxxxxxxx> [ 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@xxxxxxxxxx> Signed-off-by: Philipp Stanner <pstanner@xxxxxxxxxx> Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx> Reviewed-by: Zack Rusin <zackr@xxxxxxxxxx> Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20230920123612.16914-5-pstanner@xxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- 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
