Commit 172411f1 authored by Davi Arnaut's avatar Davi Arnaut Committed by Linus Torvalds

[PATCH] ebcdic do_kdsk_ioctl off-by-one

Add a missing return check from strnlen_user and fixes a off-by-one when
terminating the string with zero.
Signed-off-by: default avatarDavi Arnaut <davi.arnaut@gmail.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 46d0d2c8
......@@ -440,7 +440,11 @@ do_kdgkb_ioctl(struct kbd_data *kbd, struct kbsentry __user *u_kbs,
return -EPERM;
len = strnlen_user(u_kbs->kb_string,
sizeof(u_kbs->kb_string) - 1);
p = kmalloc(len, GFP_KERNEL);
if (!len)
return -EFAULT;
if (len > sizeof(u_kbs->kb_string) - 1)
return -EINVAL;
p = kmalloc(len + 1, GFP_KERNEL);
if (!p)
return -ENOMEM;
if (copy_from_user(p, u_kbs->kb_string, len)) {
......
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