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video: Fix crash when scroll screen

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After enabling log printing to lcd, when the screen starts
scrolling, system crashes. Log is shown as bellow:

    "Synchronous Abort" handler, esr 0x96000045
    "Synchronous Abort" handler, esr 0x96000045

Checking the source code, we found that the variable "pixels"
gets a wrong value:

    int pixels = VIDEO_FONT_HEIGHT * vid_priv->line_length;

"pixels" here means the value of pixels for a character, rather
than the bytes for a character. So the variable "pixels" is 4
times bigger than it's exact value, which will cause the memory
overflow when the cpu runs the following code:

    for (i = 0; i < pixels; i++)
        *dst++ = clr; <<----

Signed-off-by: Eric Gao <eric.gao@rock-chips.com>
This commit is contained in:
eric.gao@rock-chips.com 2017-04-10 10:02:20 +08:00 • committed by Anatolij Gustschin
parent e6a419c5f7
commit 7682736c89
1 changed files with 1 additions and 1 deletions
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2
drivers/video/console_normal.c
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@ -18,7 +18,7 @@ static int console_normal_set_row(struct udevice *dev, uint row, int clr)
{
struct video_priv *vid_priv = dev_get_uclass_priv(dev->parent);
void *line;
int pixels = VIDEO_FONT_HEIGHT * vid_priv->line_length;
int pixels = VIDEO_FONT_HEIGHT * vid_priv->xsize;
int i;
line = vid_priv->fb + row * VIDEO_FONT_HEIGHT * vid_priv->line_length;