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authorYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>2014-04-02 12:48:42 +0900
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-04-14 06:50:04 -0700
commit64eb5b6911e1edbb5db537fe1fa27ac936c1dd0c (patch)
tree405b8f68517e88fbf4957bfd824aba990f7f41be
parentae8af81b5024a1f451165dd0cde946daad943420 (diff)
isdnloop: Validate NUL-terminated strings from user.
[ 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/isdn/isdnloop/isdnloop.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/isdn/isdnloop/isdnloop.c b/drivers/isdn/isdnloop/isdnloop.c
index 02125e6a9109..e1f8748ff25d 100644
--- a/drivers/isdn/isdnloop/isdnloop.c
+++ b/drivers/isdn/isdnloop/isdnloop.c
@@ -1070,6 +1070,12 @@ 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: