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-rw-r--r--drivers/video/fbdev/sbuslib.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/video/fbdev/sbuslib.c b/drivers/video/fbdev/sbuslib.c
index 90c51330969c..01a7110e61a7 100644
--- a/drivers/video/fbdev/sbuslib.c
+++ b/drivers/video/fbdev/sbuslib.c
@@ -171,7 +171,7 @@ int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg,
get_user(ublue, &c->blue))
return -EFAULT;
- if (index + count > cmap->len)
+ if (index > cmap->len || count > cmap->len - index)
return -EINVAL;
for (i = 0; i < count; i++) {