From d2a34c13e7ccec5d06eafd60e6f80ea531b34668 Mon Sep 17 00:00:00 2001 From: Julia Lawall Date: Tue, 15 Dec 2009 16:46:26 -0800 Subject: [PATCH] drivers/video: Move dereference after NULL test If the NULL test on fbi is needed, then the dereference should be after the NULL test. A simplified version of the semantic match that detects this problem is as follows (http://coccinelle.lip6.fr/): // @match exists@ expression x, E; identifier fld; @@ * x->fld ... when != \(x = E\|&x\) * x == NULL // Signed-off-by: Julia Lawall Cc: Krzysztof Helt Cc: Eric Miao Cc: Daniel Mack Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/video/pxafb.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/video/pxafb.c b/drivers/video/pxafb.c index b7e58059b592..415858b421b3 100644 --- a/drivers/video/pxafb.c +++ b/drivers/video/pxafb.c @@ -1221,13 +1221,14 @@ static void setup_smart_timing(struct pxafb_info *fbi, static int pxafb_smart_thread(void *arg) { struct pxafb_info *fbi = arg; - struct pxafb_mach_info *inf = fbi->dev->platform_data; + struct pxafb_mach_info *inf; - if (!fbi || !inf->smart_update) { + if (!fbi || !fbi->dev->platform_data->smart_update) { pr_err("%s: not properly initialized, thread terminated\n", __func__); return -EINVAL; } + inf = fbi->dev->platform_data; pr_debug("%s(): task starting\n", __func__); -- 2.39.5