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authorTomi Valkeinen <tomi.valkeinen@ti.com>2013-04-18 08:39:47 +0300
committerTomi Valkeinen <tomi.valkeinen@ti.com>2013-04-26 08:28:56 +0300
commit04f8afbec37f63fafce16e454a7848426aa36202 (patch)
tree1c761c03f67ebdc71163aaaf0389a092f29916c6 /drivers/video/gbefb.c
parent11bd5933abe033fb7a3a0d1f1bd2cb4b6df8143f (diff)
fbdev: improve fb_mmap bounds checks
Improve fb_mmap bounds checks in gbefb, smscufx, udlfb and vfb drivers to prevent possible uint overflows. Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com> Cc: Steve Glendinning <steve.glendinning@smsc.com> Cc: Bernie Thompson <bernie@plugable.com>
Diffstat (limited to 'drivers/video/gbefb.c')
-rw-r--r--drivers/video/gbefb.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/video/gbefb.c b/drivers/video/gbefb.c
index bda5e3941510..ceab37020fff 100644
--- a/drivers/video/gbefb.c
+++ b/drivers/video/gbefb.c
@@ -1016,7 +1016,9 @@ static int gbefb_mmap(struct fb_info *info,
/* check range */
if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
return -EINVAL;
- if (offset + size > gbe_mem_size)
+ if (size > gbe_mem_size)
+ return -EINVAL;
+ if (offset > gbe_mem_size - size)
return -EINVAL;
/* remap using the fastest write-through mode on architecture */