thinkpad-acpi: restrict procfs count value to sane upper limit
Michael Buesch [Sat, 1 Aug 2009 15:04:19 +0000 (12:04 -0300)]
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

index 27d68e7..18f9ee6 100644 (file)
@@ -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)