s3c-fb: fix various null references on framebuffer memory alloc failure
The following problems were found in the above situation:
sfb->windows[win] was being assigned at the end of s3c_fb_probe_win only.
This resulted in passing a NULL to s3c_fb_release_win if probe_win
returned early and a memory leak.
dma_free_writecombine does not allow its third argument to be NULL.
fb_dealloc_cmap does not verify whether its argument is not NULL.
Signed-off-by: Pawel Osciak <p.osciak@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: InKi Dae <inki.dae@samsung.com>
Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/video/s3c-fb.c b/drivers/video/s3c-fb.c
index b00c064..77f5765 100644
--- a/drivers/video/s3c-fb.c
+++ b/drivers/video/s3c-fb.c
@@ -804,7 +804,8 @@
{
struct fb_info *fbi = win->fbinfo;
- dma_free_writecombine(sfb->dev, PAGE_ALIGN(fbi->fix.smem_len),
+ if (fbi->screen_base)
+ dma_free_writecombine(sfb->dev, PAGE_ALIGN(fbi->fix.smem_len),
fbi->screen_base, fbi->fix.smem_start);
}
@@ -819,7 +820,8 @@
{
if (win->fbinfo) {
unregister_framebuffer(win->fbinfo);
- fb_dealloc_cmap(&win->fbinfo->cmap);
+ if (win->fbinfo->cmap.len)
+ fb_dealloc_cmap(&win->fbinfo->cmap);
s3c_fb_free_memory(sfb, win);
framebuffer_release(win->fbinfo);
}
@@ -865,6 +867,7 @@
WARN_ON(windata->win_mode.yres == 0);
win = fbinfo->par;
+ *res = win;
var = &fbinfo->var;
win->variant = *variant;
win->fbinfo = fbinfo;
@@ -939,7 +942,6 @@
return ret;
}
- *res = win;
dev_info(sfb->dev, "window %d: fb %s\n", win_no, fbinfo->fix.id);
return 0;