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Subject: media: mceusb: Fix potential out-of-bounds shift Author: James Reynolds jr@memlen.com Date: Tue Dec 22 13:07:04 2020 +0100
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@vger.kernel.org Reported-by: syzbot+ec3b3128c576e109171d@syzkaller.appspotmail.com Signed-off-by: James Reynolds jr@memlen.com Signed-off-by: Sean Young sean@mess.org Signed-off-by: Mauro Carvalho Chehab mchehab+huawei@kernel.org
drivers/media/rc/mceusb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/drivers/media/rc/mceusb.c b/drivers/media/rc/mceusb.c index f1dbd059ed08..c8d63673e131 100644 --- a/drivers/media/rc/mceusb.c +++ b/drivers/media/rc/mceusb.c @@ -1169,7 +1169,7 @@ static void mceusb_handle_command(struct mceusb_dev *ir, u8 *buf_in) 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;