From cd7d7e0244955a4694d1e79e8c8a9bef163d6305 Mon Sep 17 00:00:00 2001 From: Pawel Osciak Date: Tue, 10 Aug 2010 18:02:35 -0700 Subject: [PATCH] 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 Signed-off-by: Kyungmin Park Cc: InKi Dae Cc: Ben Dooks Cc: Marek Szyprowski Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/video/s3c-fb.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) 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 @@ 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; -- 2.7.4