[PATCH 1/6] s3c-fb: Fix various null references on framebuffer memory
From: Pawel Osciak <hidden>
Date: 2010-05-31 09:08:50
Also in:
linux-arm-kernel, linux-samsung-soc
Subsystem:
framebuffer layer, the rest · Maintainers:
Helge Deller, Linus Torvalds
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 <redacted> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> --- drivers/video/s3c-fb.c | 8 +++++--- 1 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/video/s3c-fb.c b/drivers/video/s3c-fb.c
index b00c064..d998324 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) + 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;
--
1.7.0.4