soundwire: qcom: fix storing port config out-of-bounds

commit 490937d479abe5f6584e69b96df066bc87be92e9 upstream.

The 'qcom_swrm_ctrl->pconfig' has size of QCOM_SDW_MAX_PORTS (14),
however we index it starting from 1, not 0, to match real port numbers.
This can lead to writing port config past 'pconfig' bounds and
overwriting next member of 'qcom_swrm_ctrl' struct.  Reported also by
smatch:

  drivers/soundwire/qcom.c:1269 qcom_swrm_get_port_config() error: buffer overflow 'ctrl->pconfig' 14 <= 14

Fixes: 9916c02ccd74 ("soundwire: qcom: cleanup internal port config indexing")
Cc: <stable@vger.kernel.org>
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <error27@gmail.com>
Link: https://lore.kernel.org/r/202305201301.sCJ8UDKV-lkp@intel.com/
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230601102525.609627-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
index b2eb3090f4b46d8c027aaec014cf52479243bf85..08934d27f709ef870bff616667db94f2ee4c7d20 100644 (file)
--- a/drivers/soundwire/qcom.c
+++ b/drivers/soundwire/qcom.c
@@ -167,7 +167,8 @@ struct qcom_swrm_ctrl {
        u32 intr_mask;
        u8 rcmd_id;
        u8 wcmd_id;
-       struct qcom_swrm_port_config pconfig[QCOM_SDW_MAX_PORTS];
+       /* Port numbers are 1 - 14 */
+       struct qcom_swrm_port_config pconfig[QCOM_SDW_MAX_PORTS + 1];
        struct sdw_stream_runtime *sruntime[SWRM_MAX_DAIS];
        enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
        int (*reg_read)(struct qcom_swrm_ctrl *ctrl, int reg, u32 *val);