Hi,
On Wednesday, January 18, 2017 03:51:51 PM Arvind Yadav wrote:
> Here, If ioremap_nocache will fail. It will return NULL.
> Kernel can run into a NULL-pointer dereference.
> This error check will avoid NULL pointer dereference.
>
> Signed-off-by: Arvind Yadav <arvind.yadav.cs@xxxxxxxxx>
Thanks, I queued your patch with some minor changes for 4.11
(you can see the final version of the patch below).
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
From: Arvind Yadav <arvind.yadav.cs@xxxxxxxxx>
Subject: [PATCH v1] video: fbdev: stifb: handle NULL return value from ioremap_nocache
Add missing error check for ioremap_nocache() failure
(prevents NULL pointer dereference on error).
Cc: "James E.J. Bottomley" <jejb@xxxxxxxxxxxxxxxx>
Cc: Helge Deller <deller@xxxxxx>
Signed-off-by: Arvind Yadav <arvind.yadav.cs@xxxxxxxxx>
[b.zolnierkie: minor fixes]
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
---
drivers/video/fbdev/stifb.c | 4 ++++
1 file changed, 4 insertions(+)
Index: b/drivers/video/fbdev/stifb.c
===================================================================
--- a/drivers/video/fbdev/stifb.c 2017-01-30 16:55:15.766435453 +0100
+++ b/drivers/video/fbdev/stifb.c 2017-01-30 16:55:15.750435453 +0100
@@ -1294,6 +1294,10 @@ static int __init stifb_init_fb(struct s
strcpy(fix->id, "stifb");
info->fbops = &stifb_ops;
info->screen_base = ioremap_nocache(REGION_BASE(fb,1), fix->smem_len);
+ if (!info->screen_base) {
+ printk(KERN_ERR "stifb: failed to map memory\n");
+ goto out_err0;
+ }
info->screen_size = fix->smem_len;
info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_COPYAREA;
info->pseudo_palette = &fb->pseudo_palette;
--
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