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s3c-fb: fix various null references on framebuffer memory alloc failure

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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>
This commit is contained in:
Pawel Osciak 2010-08-10 18:02:35 -07:00 committed by Linus Torvalds
parent bc2da1b6fb
commit cd7d7e0244
1 changed files with 5 additions and 3 deletions
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8
drivers/video/s3c-fb.c
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@ -804,7 +804,8 @@ static void s3c_fb_free_memory(struct s3c_fb *sfb, struct s3c_fb_win *win)
{
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 @@ static void s3c_fb_release_win(struct s3c_fb *sfb, struct s3c_fb_win *win)
{
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 @@ static int __devinit s3c_fb_probe_win(struct s3c_fb *sfb, unsigned int win_no,
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 @@ static int __devinit s3c_fb_probe_win(struct s3c_fb *sfb, unsigned int win_no,
return ret;
}
*res = win;
dev_info(sfb->dev, "window %d: fb %s\n", win_no, fbinfo->fix.id);
return 0;