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| author |   Tomi Valkeinen <tomi.valkeinen@ti.com> | 2013-04-18 08:39:47 +0300 |
|---|---|---|
| committer | Tomi Valkeinen <tomi.valkeinen@ti.com> | 2013-04-26 08:28:56 +0300 |
| commit | 04f8afbec37f63fafce16e454a7848426aa36202 (patch) | |
| tree | 1c761c03f67ebdc71163aaaf0389a092f29916c6 /drivers/video/udlfb.c | |
| parent | fbdev/ps3fb: use vm_iomap_memory() (diff) | |
| download | linux-dev-04f8afbec37f63fafce16e454a7848426aa36202.tar.xz linux-dev-04f8afbec37f63fafce16e454a7848426aa36202.zip | |
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/udlfb.c')
| -rw-r--r-- | drivers/video/udlfb.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/video/udlfb.c b/drivers/video/udlfb.c index 86d449ea3169..ec03e726c940 100644 --- a/drivers/video/udlfb.c +++ b/drivers/video/udlfb.c @@ -324,7 +324,11 @@ static int dlfb_ops_mmap(struct fb_info *info, struct vm_area_struct *vma) unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; unsigned long page, pos; - if (offset + size > info->fix.smem_len) + if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) + return -EINVAL; + if (size > info->fix.smem_len) + return -EINVAL; + if (offset > info->fix.smem_len - size) return -EINVAL; pos = (unsigned long)info->fix.smem_start + offset; |