diff options
| author | James Reynolds <jr@memlen.com> | 2020-12-22 13:07:04 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2021-01-14 13:45:38 +0100 |
| commit | 1b43bad31fb0e00f45baf5b05bd21eb8d8ce7f58 (patch) | |
| tree | ec8cdc05192330df80c9f1b768ca7017de92c9ce /drivers | |
| parent | 4487e0215560392bd11c9de08d60824d72c89cd9 (diff) | |
| download | linux-1b43bad31fb0e00f45baf5b05bd21eb8d8ce7f58.tar.bz2 | |
media: mceusb: Fix potential out-of-bounds shift
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/media/rc/mceusb.c | 2 |
1 files changed, 1 insertions, 1 deletions
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; |