tree 40b3d3f68ee8bc38f6c455c8722c95241690f058
parent 0efe5e32c8729ef44b00d9a7203e4c99a6378b27
author Arjan van de Ven <arjan@linux.intel.com> 1253991025 +0200
committer Len Brown <len.brown@intel.com> 1254545952 -0400

ACPI: Fix bound checks for copy_from_user in the acpi /proc code

The ACPI /proc write() code takes an unsigned length argument like any write()
function, but then assigned it to a *signed* integer called "len".
Only after this is a sanity check for len done to make it not larger than 4.

Due to the type change a len < 0 is in principle also possible; this patch
adds a check for this.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>