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drivers/vesa: Don't dereference frame_buffer when NULL

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* Solves the KDL side of #14905
* We do it quietly since we don't want a log event every blit

Change-Id: I8e9b55fab78bd1742a4282dd0812823f33dd9f32
This commit is contained in:
Alexander von Gluck IV
2019-02-15 15:27:32 -06:00
parent 50428c35ad
commit 122efe3a12
1 changed files with 4 additions and 0 deletions
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src/add-ons/kernel/drivers/graphics/vesa/vga.cpp
+4
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@@ -39,6 +39,10 @@ status_t
vga_planar_blit(vesa_shared_info *info, uint8 *src, int32 srcBPR, vga_planar_blit(vesa_shared_info *info, uint8 *src, int32 srcBPR,
int32 left, int32 top, int32 right, int32 bottom) int32 left, int32 top, int32 right, int32 bottom)
{ {
// If we don't actually have a frame_buffer, bail.
if (info->frame_buffer == NULL)
return B_BAD_ADDRESS;
int32 dstBPR = info->bytes_per_row; int32 dstBPR = info->bytes_per_row;
uint8 *dst = info->frame_buffer + top * dstBPR + left / 8; uint8 *dst = info->frame_buffer + top * dstBPR + left / 8;