From e1ca5f39c2e37a3a8cdae005b94c3fc385be4240 Mon Sep 17 00:00:00 2001 From: Qasim Ijaz Date: Sat, 29 Mar 2025 00:20:03 +0000 Subject: [PATCH] HID: wacom: handle kzalloc() allocation failure in wacom_wac_queue_flush() During wacom_wac_queue_flush() the code calls kzalloc() to allocate a zero initialised buffer which it uses as a storage buffer to get data from the fifo via kfifo_out(). However it does not check kzalloc() for allocation failure which returns NULL and could potentially lead to a NULL deref. Fix this by checking for kzalloc() failure and skipping the current entry if allocation failure occurs. Fixes: 5e013ad20689 ("HID: wacom: Remove static WACOM_PKGLEN_MAX limit") Signed-off-by: Qasim Ijaz Reviewed-by: Jason Gerecke Signed-off-by: Jiri Kosina --- drivers/hid/wacom_sys.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c index 97393a3083ca..43d892810c9e 100644 --- a/drivers/hid/wacom_sys.c +++ b/drivers/hid/wacom_sys.c @@ -70,10 +70,16 @@ static void wacom_wac_queue_flush(struct hid_device *hdev, { while (!kfifo_is_empty(fifo)) { int size = kfifo_peek_len(fifo); - u8 *buf = kzalloc(size, GFP_KERNEL); + u8 *buf; unsigned int count; int err; + buf = kzalloc(size, GFP_KERNEL); + if (!buf) { + kfifo_skip(fifo); + continue; + } + count = kfifo_out(fifo, buf, size); if (count != size) { // Hard to say what is the "right" action in this