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disp: msm: add check for null pointer dereferencing

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Add check for null pointers before accessing.

Change-Id: I33deb1e931098c246326a01e743a2db760320471
Signed-off-by: Samantha Tran <samtran@codeaurora.org>
This commit is contained in:
Samantha Tran
2021-03-02 12:51:31 -08:00
parent f9ff8af5b6
commit e8cbb8822b
3 changed files with 18 additions and 4 deletions
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5
msm/dp/dp_debug.c
View File

@@ -633,13 +633,16 @@ static ssize_t dp_debug_mmrm_clk_cb_write(struct file *file,
size_t len = 0;
struct dss_clk_mmrm_cb mmrm_cb_data;
struct mmrm_client_notifier_data notifier_data;
struct dp_display *dp_display = debug->display;
struct dp_display *dp_display;
int cb_type;
if (!debug)
return -ENODEV;
if (*ppos)
return 0;
dp_display = debug->display;
len = min_t(size_t, count, SZ_8 - 1);
if (copy_from_user(buf, user_buff, len))
return 0;

11
msm/dsi/dsi_display.c
View File

@@ -6321,6 +6321,9 @@ int dsi_display_drm_ext_bridge_init(struct dsi_display *display,
if (display->panel && !display->panel->host_config.ext_bridge_mode)
return 0;
if (!bridge)
return -EINVAL;
for (i = 0; i < display->ext_bridge_cnt; i++) {
struct dsi_display_ext_bridge *ext_bridge_info =
&display->ext_bridge[i];
@@ -6371,6 +6374,14 @@ int dsi_display_drm_ext_bridge_init(struct dsi_display *display,
ext_conn = list_last_entry(&drm->mode_config.connector_list,
struct drm_connector, head);
if (!ext_conn) {
DSI_ERR("failed to get external connector\n");
rc = PTR_ERR(ext_conn);
spin_unlock_irq(&drm->mode_config.connector_list_lock);
goto error;
}
drm_connector_for_each_possible_encoder(ext_conn, c_encoder)
break;

4
msm/sde/sde_crtc.c
View File

@@ -502,7 +502,7 @@ static bool sde_crtc_mode_fixup(struct drm_crtc *crtc,
struct drm_connector *connector;
struct drm_encoder *encoder;
struct drm_connector_state *new_conn_state;
struct sde_connector_state *c_conn_state;
struct sde_connector_state *c_conn_state = NULL;
bool encoder_valid = false;
int i;
@@ -527,11 +527,11 @@ static bool sde_crtc_mode_fixup(struct drm_crtc *crtc,
for_each_new_connector_in_state(c_state->state, connector,
new_conn_state, i) {
if (new_conn_state->best_encoder == encoder) {
c_conn_state = to_sde_connector_state(new_conn_state);
break;
}
}
c_conn_state = to_sde_connector_state(new_conn_state);
if (!c_conn_state) {
SDE_ERROR("could not get connector state\n");
return true;