This is a note to let you know that I've just added the patch titled media: mceusb: Fix potential out-of-bounds shift to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: media-mceusb-fix-potential-out-of-bounds-shift.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 1b43bad31fb0e00f45baf5b05bd21eb8d8ce7f58 Mon Sep 17 00:00:00 2001 From: James Reynolds <jr@xxxxxxxxxx> Date: Tue, 22 Dec 2020 13:07:04 +0100 Subject: media: mceusb: Fix potential out-of-bounds shift From: James Reynolds <jr@xxxxxxxxxx> commit 1b43bad31fb0e00f45baf5b05bd21eb8d8ce7f58 upstream. When processing a MCE_RSP_GETPORTSTATUS command, the bit index to set in ir->txports_cabled comes from response data, and isn't validated. As ir->txports_cabled is a u8, nothing should be done if the bit index is greater than 7. Cc: stable@xxxxxxxxxxxxxxx Reported-by: syzbot+ec3b3128c576e109171d@xxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: James Reynolds <jr@xxxxxxxxxx> Signed-off-by: Sean Young <sean@xxxxxxxx> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/media/rc/mceusb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/media/rc/mceusb.c +++ b/drivers/media/rc/mceusb.c @@ -1169,7 +1169,7 @@ static void mceusb_handle_command(struct switch (subcmd) { /* the one and only 5-byte return value command */ case MCE_RSP_GETPORTSTATUS: - if (buf_in[5] == 0) + if (buf_in[5] == 0 && *hi < 8) ir->txports_cabled |= 1 << *hi; break; Patches currently in stable-queue which might be from jr@xxxxxxxxxx are queue-5.10/media-mceusb-fix-potential-out-of-bounds-shift.patch