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>
mariux64 · Aug 2, 2009 · 5b05d46 · 5b05d46
1 parent 1f6fc2d
commit 5b05d46
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
@@ -766,6 +766,8 @@ static int dispatch_procfs_write(struct file *file,
 
 	if (!ibm || !ibm->write)
 		return -EINVAL;
+	if (count > PAGE_SIZE - 2)
+		return -EINVAL;
 
 	kernbuf = kmalloc(count + 2, GFP_KERNEL);
 	if (!kernbuf)