Merge: CVE-2025-38380: i2c/designware: Fix an initialization issue

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/7192

JIRA: https://issues.redhat.com/browse/RHEL-106622
CVE: CVE-2025-38380

```
commit 3d30048
Author: Michael J. Ruhl <michael.j.ruhl@intel.com>
Date:   Fri Jun 27 10:35:11 2025 -0400

    i2c/designware: Fix an initialization issue

    The i2c_dw_xfer_init() function requires msgs and msg_write_idx from the
    dev context to be initialized.

    amd_i2c_dw_xfer_quirk() inits msgs and msgs_num, but not msg_write_idx.

    This could allow an out of bounds access (of msgs).

    Initialize msg_write_idx before calling i2c_dw_xfer_init().

    Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
    Fixes: 17631e8 ("i2c: designware: Add driver support for AMD NAVI GPU")
    Cc: <stable@vger.kernel.org> # v5.13+
    Signed-off-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
    Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
    Link: https://lore.kernel.org/r/20250627143511.489570-1-michael.j.ruhl@intel.com
```

Signed-off-by: CKI Backport Bot <cki-ci-bot+cki-gitlab-backport-bot@redhat.com>

---

<small>Created 2025-07-30 18:34 UTC by backporter - [KWF FAQ](https://red.ht/kernel_workflow_doc) - [Slack #team-kernel-workflow](https://redhat-internal.slack.com/archives/C04LRUPMJQ5) - [Source](https://gitlab.com/cki-project/kernel-workflow/-/blob/main/webhook/utils/backporter.py) - [Documentation](https://gitlab.com/cki-project/kernel-workflow/-/blob/main/docs/README.backporter.md) - [Report an issue](https://issues.redhat.com/secure/CreateIssueDetails!init.jspa?pid=12334433&issuetype=1&priority=4&summary=backporter+webhook+issue&components=kernel-workflow+/+backporter)</small>

Approved-by: Steve Best <sbest@redhat.com>
Approved-by: Tony Camuso <tcamuso@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: Augusto Caringi <acaringi@redhat.com>

Author: caringi

drivers/i2c/busses/i2c-designware-master.c

@@ -298,6 +298,7 @@ static int amd_i2c_dw_xfer_quirk(struct i2c_adapter *adap, struct i2c_msg *msgs,
 
 	dev->msgs = msgs;
 	dev->msgs_num = num_msgs;
+	dev->msg_write_idx = 0;
 	i2c_dw_xfer_init(dev);
 	i2c_dw_disable_int(dev);