5.15-stable review patch. If anyone has any objections, please let me know.
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From: Philipp Stanner pstanner@redhat.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@redhat.com Signed-off-by: Philipp Stanner pstanner@redhat.com Reviewed-by: Kees Cook keescook@chromium.org Reviewed-by: Zack Rusin zackr@vmware.com Signed-off-by: Dave Airlie airlied@redhat.com Link: https://patchwork.freedesktop.org/patch/msgid/20230920123612.16914-5-pstanne... Signed-off-by: Sasha Levin sashal@kernel.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 54cbaa9711398..ae31bf8d2feb1 100644 --- a/kernel/watch_queue.c +++ b/kernel/watch_queue.c @@ -338,7 +338,7 @@ 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);