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drm/nouveau/fbcon: fix out-of-bounds memory accesses

Browse source 
Reported by KASAN.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Ben Skeggs 2016-06-02 12:23:31 +10:00
parent 383d0a419f
commit f045f459d9
4 changed files with 7 additions and 13 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
drivers/gpu/drm/nouveau/nouveau_fbcon.c
View file

@ -552,6 +552,7 @@ nouveau_fbcon_init(struct drm_device *dev)
if (ret)
goto fini;
fbcon->helper.fbdev->pixmap.buf_align = 4;
return 0;
fini:

7
drivers/gpu/drm/nouveau/nv04_fbcon.c
View file

@ -82,7 +82,6 @@ nv04_fbcon_imageblit(struct fb_info *info, const struct fb_image *image)
uint32_t fg;
uint32_t bg;
uint32_t dsize;
uint32_t width;
uint32_t *data = (uint32_t *)image->data;
int ret;
@ -93,9 +92,6 @@ nv04_fbcon_imageblit(struct fb_info *info, const struct fb_image *image)
if (ret)
return ret;
width = ALIGN(image->width, 8);
dsize = ALIGN(width * image->height, 32) >> 5;
if (info->fix.visual == FB_VISUAL_TRUECOLOR ||
info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
fg = ((uint32_t *) info->pseudo_palette)[image->fg_color];
@ -111,10 +107,11 @@ nv04_fbcon_imageblit(struct fb_info *info, const struct fb_image *image)
((image->dx + image->width) & 0xffff));
OUT_RING(chan, bg);
OUT_RING(chan, fg);
OUT_RING(chan, (image->height << 16) | width);
OUT_RING(chan, (image->height << 16) | image->width);
OUT_RING(chan, (image->height << 16) | image->width);
OUT_RING(chan, (image->dy << 16) | (image->dx & 0xffff));
dsize = ALIGN(image->width * image->height, 32) >> 5;
while (dsize) {
int iter_len = dsize > 128 ? 128 : dsize;

6
drivers/gpu/drm/nouveau/nv50_fbcon.c
View file

@ -95,7 +95,7 @@ nv50_fbcon_imageblit(struct fb_info *info, const struct fb_image *image)
struct nouveau_fbdev *nfbdev = info->par;
struct nouveau_drm *drm = nouveau_drm(nfbdev->dev);
struct nouveau_channel *chan = drm->channel;
uint32_t width, dwords, *data = (uint32_t *)image->data;
uint32_t dwords, *data = (uint32_t *)image->data;
uint32_t mask = ~(~0 >> (32 - info->var.bits_per_pixel));
uint32_t *palette = info->pseudo_palette;
int ret;
@ -107,9 +107,6 @@ nv50_fbcon_imageblit(struct fb_info *info, const struct fb_image *image)
if (ret)
return ret;
width = ALIGN(image->width, 32);
dwords = (width * image->height) >> 5;
BEGIN_NV04(chan, NvSub2D, 0x0814, 2);
if (info->fix.visual == FB_VISUAL_TRUECOLOR ||
info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
@ -128,6 +125,7 @@ nv50_fbcon_imageblit(struct fb_info *info, const struct fb_image *image)
OUT_RING(chan, 0);
OUT_RING(chan, image->dy);
dwords = ALIGN(image->width * image->height, 32) >> 5;
while (dwords) {
int push = dwords > 2047 ? 2047 : dwords;

6
drivers/gpu/drm/nouveau/nvc0_fbcon.c
View file

@ -95,7 +95,7 @@ nvc0_fbcon_imageblit(struct fb_info *info, const struct fb_image *image)
struct nouveau_fbdev *nfbdev = info->par;
struct nouveau_drm *drm = nouveau_drm(nfbdev->dev);
struct nouveau_channel *chan = drm->channel;
uint32_t width, dwords, *data = (uint32_t *)image->data;
uint32_t dwords, *data = (uint32_t *)image->data;
uint32_t mask = ~(~0 >> (32 - info->var.bits_per_pixel));
uint32_t *palette = info->pseudo_palette;
int ret;
@ -107,9 +107,6 @@ nvc0_fbcon_imageblit(struct fb_info *info, const struct fb_image *image)
if (ret)
return ret;
width = ALIGN(image->width, 32);
dwords = (width * image->height) >> 5;
BEGIN_NVC0(chan, NvSub2D, 0x0814, 2);
if (info->fix.visual == FB_VISUAL_TRUECOLOR ||
info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
@ -128,6 +125,7 @@ nvc0_fbcon_imageblit(struct fb_info *info, const struct fb_image *image)
OUT_RING (chan, 0);
OUT_RING (chan, image->dy);
dwords = ALIGN(image->width * image->height, 32) >> 5;
while (dwords) {
int push = dwords > 2047 ? 2047 : dwords;