diff mbox series

[3/5] kernel: watch_queue: copy user-array safely

Message ID 4168bc2d9313d5d1a1a2b9ca0b9fc2990d499506.1693386602.git.pstanner@redhat.com (mailing list archive)
State New, archived
Headers show
Series Introduce new wrappers to copy user-arrays | expand

Commit Message

Philipp Stanner Aug. 30, 2023, 1:45 p.m. UTC 
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>
---
 kernel/watch_queue.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/kernel/watch_queue.c b/kernel/watch_queue.c
index d0b6b390ee42..778b4056700f 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);