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[S390] keyboard: integer underflow bug

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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>
This commit is contained in:
Dan Carpenter 2011-03-03 17:56:06 +01:00 committed by Martin Schwidefsky
parent 0c0db0355b
commit b652277b09
1 changed files with 2 additions and 1 deletions
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3
drivers/s390/char/keyboard.c
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@ -460,7 +460,8 @@ kbd_ioctl(struct kbd_data *kbd, struct file *file,
unsigned int cmd, unsigned long arg)
{
void __user *argp;
int ct, perm;
unsigned int ct;
int perm;
argp = (void __user *)arg;