tree 46bdf19836227b27c4548431ec7cea5eeb2a8a08
parent 1bafeb378e915f39b1bf44ee0871823d6f402ea5
author Ian Abbott <abbotti@mev.co.uk> 1235496179 +0000
committer Greg Kroah-Hartman <gregkh@suse.de> 1237937905 -0700

UIO: Take offset into account when determining number of pages that can be mapped

If a UIO memory region does not start on a page boundary but straddles one,
the number of actual pages that overlap the memory region may be calculated
incorrectly because the offset isn't taken into account.  If userspace sets
the mmap length to offset+size, it may fail with -EINVAL if UIO thinks it's
trying to allocate too many pages.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Cc: Hans J. Koch <hjk@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>