Upgrade to 4.4.50-rt62

[kvmfornfv.git] / kernel / drivers / video / fbdev / core / fbcmap.c

diff --git a/kernel/drivers/video/fbdev/core/fbcmap.c b/kernel/drivers/video/fbdev/core/fbcmap.c
index f89245b..68a1135 100644 (file)
--- a/kernel/drivers/video/fbdev/core/fbcmap.c
+++ b/kernel/drivers/video/fbdev/core/fbcmap.c
@@ -163,17 +163,18 @@ void fb_dealloc_cmap(struct fb_cmap *cmap)
 
 int fb_copy_cmap(const struct fb_cmap *from, struct fb_cmap *to)
 {
-       int tooff = 0, fromoff = 0;
-       int size;
+       unsigned int tooff = 0, fromoff = 0;
+       size_t size;
 
        if (to->start > from->start)
                fromoff = to->start - from->start;
        else
                tooff = from->start - to->start;
-       size = to->len - tooff;
-       if (size > (int) (from->len - fromoff))
-               size = from->len - fromoff;
-       if (size <= 0)
+       if (fromoff >= from->len || tooff >= to->len)
+               return -EINVAL;
+
+       size = min_t(size_t, to->len - tooff, from->len - fromoff);
+       if (size == 0)
                return -EINVAL;
        size *= sizeof(u16);
 
@@ -187,17 +188,18 @@ int fb_copy_cmap(const struct fb_cmap *from, struct fb_cmap *to)
 
 int fb_cmap_to_user(const struct fb_cmap *from, struct fb_cmap_user *to)
 {
-       int tooff = 0, fromoff = 0;
-       int size;
+       unsigned int tooff = 0, fromoff = 0;
+       size_t size;
 
        if (to->start > from->start)
                fromoff = to->start - from->start;
        else
                tooff = from->start - to->start;
-       size = to->len - tooff;
-       if (size > (int) (from->len - fromoff))
-               size = from->len - fromoff;
-       if (size <= 0)
+       if (fromoff >= from->len || tooff >= to->len)
+               return -EINVAL;
+
+       size = min_t(size_t, to->len - tooff, from->len - fromoff);
+       if (size == 0)
                return -EINVAL;
        size *= sizeof(u16);