[S390] keyboard: integer underflow bug
The "ct" variable should be an unsigned int. Both struct kbdiacrs
->kb_cnt and struct kbd_data ->accent_table_size are unsigned ints.
Making it signed causes a problem in KBDIACRUC because the user could
set the signed bit and cause a buffer overflow.
Cc: <stable@kernel.org>
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/char/keyboard.c b/drivers/s390/char/keyboard.c
index 8cd58e4..5ad44da 100644
--- a/drivers/s390/char/keyboard.c
+++ b/drivers/s390/char/keyboard.c
@@ -460,7 +460,8 @@
unsigned int cmd, unsigned long arg)
{
void __user *argp;
- int ct, perm;
+ unsigned int ct;
+ int perm;
argp = (void __user *)arg;