6.6-stable review patch. If anyone has any objections, please let me know.
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From: Michael J. Ruhl michael.j.ruhl@intel.com
commit 3d30048958e0d43425f6d4e76565e6249fa71050 upstream.
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: 17631e8ca2d3 ("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: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/i2c/busses/i2c-designware-master.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/i2c/busses/i2c-designware-master.c +++ b/drivers/i2c/busses/i2c-designware-master.c @@ -327,6 +327,7 @@ static int amd_i2c_dw_xfer_quirk(struct
dev->msgs = msgs; dev->msgs_num = num_msgs; + dev->msg_write_idx = 0; i2c_dw_xfer_init(dev); regmap_write(dev->map, DW_IC_INTR_MASK, 0);