[ 111/143] isdnloop: Validate NUL-terminated strings from user.

Willy Tarreau
2014-05-12T01:56:18Z

From: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

[ Upstream commit 77bc6bed7121936bb2e019a8c336075f4c8eef62 ]

Return -EINVAL unless all of user-given strings are correctly
NUL-terminated.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
---
drivers/isdn/isdnloop/isdnloop.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/isdn/isdnloop/isdnloop.c b/drivers/isdn/isdnloop/isdnloop.c
index bf4168b..4267d48 100644
--- a/drivers/isdn/isdnloop/isdnloop.c
+++ b/drivers/isdn/isdnloop/isdnloop.c
@@ -1071,6 +1071,12 @@ isdnloop_start(isdnloop_card * card, isdnloop_sdef * sdefp)
return -EBUSY;
if (copy_from_user((char *) &sdef, (char *) sdefp, sizeof(sdef)))
return -EFAULT;
+
+ for (i = 0; i < 3; i++) {
+ if (!memchr(sdef.num[i], 0, sizeof(sdef.num[i])))
+ return -EINVAL;
+ }
+
spin_lock_irqsave(&card->isdnloop_lock, flags);
switch (sdef.ptype) {
case ISDN_PTYPE_EURO:
--
1.7.12.2.21.g234cd45.dirty