telephony: ijx: buffer overflow in ixj_write_cid()

[Not needed in 3.8 or newer as this driver is removed there. - gregkh]

We get this from user space and nothing has been done to ensure that
these strings are NUL terminated.

Reported-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/telephony/ixj.c b/drivers/telephony/ixj.c
index d5f923bcdffeb907191297082b61cd5551226c39..e1abb45c3cfe602fa96d0fd749f26be7fed7578e 100644 (file)
--- a/drivers/telephony/ixj.c
+++ b/drivers/telephony/ixj.c
@@ -3190,12 +3190,12 @@ static void ixj_write_cid(IXJ *j)
 
        ixj_fsk_alloc(j);
 
-       strcpy(sdmf1, j->cid_send.month);
-       strcat(sdmf1, j->cid_send.day);
-       strcat(sdmf1, j->cid_send.hour);
-       strcat(sdmf1, j->cid_send.min);
-       strcpy(sdmf2, j->cid_send.number);
-       strcpy(sdmf3, j->cid_send.name);
+       strlcpy(sdmf1, j->cid_send.month, sizeof(sdmf1));
+       strlcat(sdmf1, j->cid_send.day, sizeof(sdmf1));
+       strlcat(sdmf1, j->cid_send.hour, sizeof(sdmf1));
+       strlcat(sdmf1, j->cid_send.min, sizeof(sdmf1));
+       strlcpy(sdmf2, j->cid_send.number, sizeof(sdmf2));
+       strlcpy(sdmf3, j->cid_send.name, sizeof(sdmf3));
 
        len1 = strlen(sdmf1);
        len2 = strlen(sdmf2);
@@ -3340,12 +3340,12 @@ static void ixj_write_cidcw(IXJ *j)
                ixj_pre_cid(j);
        }
        j->flags.cidcw_ack = 0;
-       strcpy(sdmf1, j->cid_send.month);
-       strcat(sdmf1, j->cid_send.day);
-       strcat(sdmf1, j->cid_send.hour);
-       strcat(sdmf1, j->cid_send.min);
-       strcpy(sdmf2, j->cid_send.number);
-       strcpy(sdmf3, j->cid_send.name);
+       strlcpy(sdmf1, j->cid_send.month, sizeof(sdmf1));
+       strlcat(sdmf1, j->cid_send.day, sizeof(sdmf1));
+       strlcat(sdmf1, j->cid_send.hour, sizeof(sdmf1));
+       strlcat(sdmf1, j->cid_send.min, sizeof(sdmf1));
+       strlcpy(sdmf2, j->cid_send.number, sizeof(sdmf2));
+       strlcpy(sdmf3, j->cid_send.name, sizeof(sdmf3));
 
        len1 = strlen(sdmf1);
        len2 = strlen(sdmf2);