From: Jeongjun Park <aha310510@gmail.com> stable inclusion from stable-v5.10.248 commit c2c293ea7b61f12cdaad1e99a5b4efc58c88960a category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/13371 CVE: CVE-2025-68819 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- commit b91e6aafe8d356086cc621bc03e35ba2299e4788 upstream. rlen value is a user-controlled value, but dtv5100_i2c_msg() does not check the size of the rlen value. Therefore, if it is set to a value larger than sizeof(st->data), an out-of-bounds vuln occurs for st->data. Therefore, we need to add proper range checking to prevent this vuln. Fixes: 60688d5e6e6e ("V4L/DVB (8735): dtv5100: replace dummy frontend by zl10353") Cc: stable@vger.kernel.org Signed-off-by: Jeongjun Park <aha310510@gmail.com> Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Liu Kai <liukai284@huawei.com> --- drivers/media/usb/dvb-usb/dtv5100.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/media/usb/dvb-usb/dtv5100.c b/drivers/media/usb/dvb-usb/dtv5100.c index 1c13e493322c..89b3a5a790d8 100644 --- a/drivers/media/usb/dvb-usb/dtv5100.c +++ b/drivers/media/usb/dvb-usb/dtv5100.c @@ -55,6 +55,11 @@ static int dtv5100_i2c_msg(struct dvb_usb_device *d, u8 addr, } index = (addr << 8) + wbuf[0]; + if (rlen > sizeof(st->data)) { + warn("rlen = %x is too big!\n", rlen); + return -EINVAL; + } + memcpy(st->data, rbuf, rlen); msleep(1); /* avoid I2C errors */ return usb_control_msg(d->udev, pipe, request, -- 2.34.1