On 11/26/2018 03:16 PM, Peter Rosin wrote:
> Ping?!
Hi,
Thank you for your patch, it will be considered for 4.21 (as it is not
a recent regression + I'm busy with other things currently).
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
> Cheers,
> Peter
>
> On 2018-11-08 10:54, Peter Rosin wrote:
>> Blitting an image with "negative" offsets is not working since there
>> is no clipping. It hopefully just crashes. For the bootup logo, there
>> is protection so that blitting does not happen as the image is drawn
>> further and further to the right (ROTATE_UR) or further and further
>> down (ROTATE_CW). There is however no protection when drawing in the
>> opposite directions (ROTATE_UD and ROTATE_CCW).
>>
>> Add back this protection.
>>
>> The regression is 20-odd years old but the mindless warning-killing
>> mentality displayed in commit 34bdb666f4b2 ("fbdev: fbmem: remove
>> positive test on unsigned values") is also to blame, methinks.
>>
>> Fixes: 448d479747b8 ("fbdev: fb_do_show_logo() updates")
>> Signed-off-by: Peter Rosin <peda@xxxxxxxxxx>
>> ---
>> drivers/video/fbdev/core/fbmem.c | 8 ++++++--
>> 1 file changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
>> index bb7f5f23e347..1abeb0b72455 100644
>> --- a/drivers/video/fbdev/core/fbmem.c
>> +++ b/drivers/video/fbdev/core/fbmem.c
>> @@ -435,7 +435,9 @@ static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
>> image->dx += image->width + 8;
>> }
>> } else if (rotate == FB_ROTATE_UD) {
>> - for (x = 0; x < num; x++) {
>> + u32 dx = image->dx;
>> +
>> + for (x = 0; x < num && image->dx <= dx; x++) {
>> info->fbops->fb_imageblit(info, image);
>> image->dx -= image->width + 8;
>> }
>> @@ -447,7 +449,9 @@ static void fb_do_show_logo(struct fb_info *info, struct fb_image *image,
>> image->dy += image->height + 8;
>> }
>> } else if (rotate == FB_ROTATE_CCW) {
>> - for (x = 0; x < num; x++) {
>> + u32 dy = image->dy;
>> +
>> + for (x = 0; x < num && image->dy <= dy; x++) {
>> info->fbops->fb_imageblit(info, image);
>> image->dy -= image->height + 8;
>> }
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