i2c/designware: Fix an initialization issue

jira VULN-79509
cve CVE-2025-38380
commit-author Michael J. Ruhl <michael.j.ruhl@intel.com>
commit 3d30048

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
(cherry picked from commit 3d30048)
	Signed-off-by: Brett Mastbergen <bmastbergen@ciq.com>

Author: bmastbergen

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);