From 5fa1f45de8fd697d9f23050e20dd65c0998e6107 Mon Sep 17 00:00:00 2001 From: Colin Ian King Date: Fri, 17 Nov 2017 17:21:48 +0100 Subject: [PATCH] video: fbdev: sm501fb: fix potential null pointer dereference on fbi 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 Cc: Sudip Mukherjee Signed-off-by: Bartlomiej Zolnierkiewicz --- 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; -- 2.45.2