commit 5b05d4696d38c3172e79e855cc1e2ed044589508
author Michael Buesch <mb@bu3sch.de> Sat Aug 01 12:04:19 2009 -0300
committer Len Brown <len.brown@intel.com> Sat Aug 01 23:50:40 2009 -0400
tree 63a23cbb029bd0cac3e7b4f4863f996664afbd26
parent 1f6fc2de9525e34ee93bd392fa046369a8cfbf1e

thinkpad-acpi: restrict procfs count value to sane upper limit

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/platform/x86/thinkpad_acpi.c

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 27d68e7..18f9ee6 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -766,6 +766,8 @@
 
 	if (!ibm || !ibm->write)
 		return -EINVAL;
+	if (count > PAGE_SIZE - 2)
+		return -EINVAL;
 
 	kernbuf = kmalloc(count + 2, GFP_KERNEL);
 	if (!kernbuf)