evie/android_kernel_oneplus_msm8998
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msm: mdss: Fix null pointer dereference and unintialisation of variables

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Add NULL checks before accessing potential null pointers. Also, fix
uninitialised variables in MDP driver as they can be accessed with
incorrect values.

Change-Id: Id8a551fd3bc147c800ee1c98c2bc2b6f3bf6d380
Signed-off-by: Krishna Manikandan <mkrishn@codeaurora.org>
This commit is contained in:
Krishna Manikandan 2016-11-28 17:52:45 +05:30
parent b832093be4
commit 0e2ee06748
5 changed files with 20 additions and 11 deletions
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2
drivers/video/fbdev/msm/mdss_dsi_host.c
View file

@ -2142,7 +2142,7 @@ static int mdss_dsi_cmd_dma_rx(struct mdss_dsi_ctrl_pdata *ctrl,
u32 *lp, *temp, data;
int i, j = 0, off, cnt;
bool ack_error = false;
char reg[16];
char reg[16] = {0x0};
int repeated_bytes = 0;
lp = (u32 *)rp->data;

4
drivers/video/fbdev/msm/mdss_hdmi_hdcp2p2.c
View file

@ -666,7 +666,7 @@ static void hdmi_hdcp2p2_link_cb(void *data)
static void hdmi_hdcp2p2_recv_msg(struct hdmi_hdcp2p2_ctrl *ctrl)
{
int rc = 0, timeout_hsync;
int timeout_hsync = 0, rc = 0;
char *recvd_msg_buf = NULL;
struct hdmi_tx_hdcp2p2_ddc_data *ddc_data;
struct hdmi_tx_ddc_ctrl *ddc_ctrl;
@ -1079,7 +1079,7 @@ error:
static bool hdmi_hdcp2p2_supported(struct hdmi_hdcp2p2_ctrl *ctrl)
{
u8 hdcp2version;
u8 hdcp2version = 0;
int rc = hdmi_hdcp2p2_read_version(ctrl, &hdcp2version);
if (rc)

6
drivers/video/fbdev/msm/mdss_mdp.c
View file

@ -823,7 +823,7 @@ void mdss_mdp_irq_clear(struct mdss_data_type *mdata,
int mdss_mdp_irq_enable(u32 intr_type, u32 intf_num)
{
int irq_idx, idx;
int irq_idx = 0;
unsigned long irq_flags;
int ret = 0;
struct mdss_data_type *mdata = mdss_mdp_get_mdata();
@ -842,7 +842,7 @@ int mdss_mdp_irq_enable(u32 intr_type, u32 intf_num)
spin_lock_irqsave(&mdp_lock, irq_flags);
if (mdata->mdp_irq_mask[irq.reg_idx] & irq.irq_mask) {
pr_warn("MDSS MDP IRQ-0x%x is already set, mask=%x\n",
irq.irq_mask, mdata->mdp_irq_mask[idx]);
irq.irq_mask, mdata->mdp_irq_mask[irq.reg_idx]);
ret = -EBUSY;
} else {
pr_debug("MDP IRQ mask old=%x new=%x\n",
@ -2433,6 +2433,8 @@ static void __update_sspp_info(struct mdss_mdp_pipe *pipe,
size_t len = PAGE_SIZE;
int num_bytes = BITS_TO_BYTES(MDP_IMGTYPE_LIMIT1);
if (!pipe)
return;
#define SPRINT(fmt, ...) \
(*cnt += scnprintf(buf + *cnt, len - *cnt, fmt, ##__VA_ARGS__))

10
drivers/video/fbdev/msm/mdss_mdp_layer.c
View file

@ -855,12 +855,18 @@ static int __validate_layer_reconfig(struct mdp_input_layer *layer,
*/
if (pipe->csc_coeff_set != layer->color_space) {
src_fmt = mdss_mdp_get_format_params(layer->buffer.format);
if (pipe->src_fmt->is_yuv && src_fmt && src_fmt->is_yuv) {
if (!src_fmt) {
pr_err("Invalid layer format %d\n",
layer->buffer.format);
status = -EINVAL;
} else {
if (pipe->src_fmt->is_yuv && src_fmt &&
src_fmt->is_yuv) {
status = -EPERM;
pr_err("csc change is not permitted on used pipe\n");
}
}
}
return status;
}

3
drivers/video/fbdev/msm/mdss_mdp_pp.c
View file

@ -2461,7 +2461,7 @@ static int pp_dspp_setup(u32 disp_num, struct mdss_mdp_mixer *mixer)
}
if (flags & PP_FLAGS_DIRTY_DITHER) {
if (!pp_ops[DITHER].pp_set_config) {
if (!pp_ops[DITHER].pp_set_config && addr) {
pp_dither_config(addr, pp_sts,
&mdss_pp_res->dither_disp_cfg[disp_num]);
} else {
@ -5308,6 +5308,7 @@ static int pp_hist_collect(struct mdp_histogram_data *hist,
else if (block == SSPP_VIG)
v_base = ctl_base +
MDSS_MDP_REG_VIG_HIST_CTL_BASE;
if (v_base)
sum = pp_hist_read(v_base, hist_info);
}
writel_relaxed(0, hist_info->base);