[PATCH] video: fbdev: sm501fb: fix potential null pointer dereference on fbi
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STALE3248d
From: Colin King <hidden>
Date: 2017-11-10 17:32:37
Also in:
dri-devel, kernel-janitors, lkml
Subsystem:
framebuffer layer, the rest · Maintainers:
Helge Deller, Linus Torvalds
From: Colin Ian King <redacted>
The pointer fbi is dereferenced with par = fbi->par before there is a
null check on fbi, hence there is a potential null pointer dereference
on a null par. Fix this by moving the dereference after the null
pointer check.
Detected by CoverityScan, CID#1461301 ("Dereference before null check")
Signed-off-by: Colin Ian King <redacted>
---
drivers/video/fbdev/sm501fb.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/video/fbdev/sm501fb.c b/drivers/video/fbdev/sm501fb.c
index 8d4fdb373299..6f0a19501c6a 100644
--- a/drivers/video/fbdev/sm501fb.c
+++ b/drivers/video/fbdev/sm501fb.c@@ -2100,11 +2100,12 @@ static int sm501fb_suspend_fb(struct sm501fb_info *info, enum sm501_controller head) { struct fb_info *fbi = info->fb[head]; - struct sm501fb_par *par = fbi->par; + struct sm501fb_par *par; if (!fbi) return 0; + par = fbi->par; if (par->screen.size = 0) return 0;
@@ -2150,11 +2151,12 @@ static void sm501fb_resume_fb(struct sm501fb_info *info, enum sm501_controller head) { struct fb_info *fbi = info->fb[head]; - struct sm501fb_par *par = fbi->par; + struct sm501fb_par *par; if (!fbi) return; + par = fbi->par; if (par->screen.size = 0) return;
--
2.14.1