diff options
| author | Hersen Wu <hersenxs.wu@amd.com> | 2024-04-24 10:09:31 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2024-05-02 16:18:17 -0400 |
| commit | 4e70c0f5251c25885c31ee84a31f99a01f7cf50e (patch) | |
| tree | 6b1ee2d7433028661c846e6a287a23f0599ab3d1 /drivers/gpu/drm/amd/display/modules | |
| parent | 5524fa301ba649f8cf00848f91468e0ba7e4f24c (diff) | |
drm/amd/display: Add array index check for hdcp ddc access
[Why]
Coverity reports OVERRUN warning. Do not check if array
index valid.
[How]
Check msg_id valid and valid array index.
Reviewed-by: Alex Hung <alex.hung@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Hersen Wu <hersenxs.wu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/modules')
| -rw-r--r-- | drivers/gpu/drm/amd/display/modules/hdcp/hdcp_ddc.c | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/drivers/gpu/drm/amd/display/modules/hdcp/hdcp_ddc.c b/drivers/gpu/drm/amd/display/modules/hdcp/hdcp_ddc.c index 8e9caae7c955..1b2df97226a3 100644 --- a/drivers/gpu/drm/amd/display/modules/hdcp/hdcp_ddc.c +++ b/drivers/gpu/drm/amd/display/modules/hdcp/hdcp_ddc.c @@ -156,11 +156,16 @@ static enum mod_hdcp_status read(struct mod_hdcp *hdcp, uint32_t cur_size = 0; uint32_t data_offset = 0; - if (msg_id == MOD_HDCP_MESSAGE_ID_INVALID) { + if (msg_id == MOD_HDCP_MESSAGE_ID_INVALID || + msg_id >= MOD_HDCP_MESSAGE_ID_MAX) return MOD_HDCP_STATUS_DDC_FAILURE; - } if (is_dp_hdcp(hdcp)) { + int num_dpcd_addrs = sizeof(hdcp_dpcd_addrs) / + sizeof(hdcp_dpcd_addrs[0]); + if (msg_id >= num_dpcd_addrs) + return MOD_HDCP_STATUS_DDC_FAILURE; + while (buf_len > 0) { cur_size = MIN(buf_len, HDCP_MAX_AUX_TRANSACTION_SIZE); success = hdcp->config.ddc.funcs.read_dpcd(hdcp->config.ddc.handle, @@ -175,6 +180,11 @@ static enum mod_hdcp_status read(struct mod_hdcp *hdcp, data_offset += cur_size; } } else { + int num_i2c_offsets = sizeof(hdcp_i2c_offsets) / + sizeof(hdcp_i2c_offsets[0]); + if (msg_id >= num_i2c_offsets) + return MOD_HDCP_STATUS_DDC_FAILURE; + success = hdcp->config.ddc.funcs.read_i2c( hdcp->config.ddc.handle, HDCP_I2C_ADDR, @@ -219,11 +229,16 @@ static enum mod_hdcp_status write(struct mod_hdcp *hdcp, uint32_t cur_size = 0; uint32_t data_offset = 0; - if (msg_id == MOD_HDCP_MESSAGE_ID_INVALID) { + if (msg_id == MOD_HDCP_MESSAGE_ID_INVALID || + msg_id >= MOD_HDCP_MESSAGE_ID_MAX) return MOD_HDCP_STATUS_DDC_FAILURE; - } if (is_dp_hdcp(hdcp)) { + int num_dpcd_addrs = sizeof(hdcp_dpcd_addrs) / + sizeof(hdcp_dpcd_addrs[0]); + if (msg_id >= num_dpcd_addrs) + return MOD_HDCP_STATUS_DDC_FAILURE; + while (buf_len > 0) { cur_size = MIN(buf_len, HDCP_MAX_AUX_TRANSACTION_SIZE); success = hdcp->config.ddc.funcs.write_dpcd( @@ -239,6 +254,11 @@ static enum mod_hdcp_status write(struct mod_hdcp *hdcp, data_offset += cur_size; } } else { + int num_i2c_offsets = sizeof(hdcp_i2c_offsets) / + sizeof(hdcp_i2c_offsets[0]); + if (msg_id >= num_i2c_offsets) + return MOD_HDCP_STATUS_DDC_FAILURE; + hdcp->buf[0] = hdcp_i2c_offsets[msg_id]; memmove(&hdcp->buf[1], buf, buf_len); success = hdcp->config.ddc.funcs.write_i2c( |