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authorDan Carpenter <dan.carpenter@oracle.com>2014-04-16 14:25:16 +0300
committerDavid S. Miller <davem@davemloft.net>2014-04-16 15:24:15 -0400
commitb7a314054eb55e3745a9409beaa5d8be5cd2d273 (patch)
treeeaae9916a4c66d1f81c31d5b876dd04fffea6260
parent74462f0d4a734274a04dbbe58099134cbe7a5522 (diff)
isdn: icn: buffer overflow in icn_command()
This buffer over was detected using static analysis: drivers/isdn/icn/icn.c:1325 icn_command() error: format string overflow. buf_size: 60 length: 98 The calculation for the length of the string is off because it assumes that the dial[] buffer holds a 50 character string, but actually it is at most 31 characters and NUL. I have removed the dial[] buffer because it isn't needed. The maximum length of the string is actually 79 characters and a NUL. I have made the cbuf[] array large enough to hold it and changed the sprintf() to an snprintf() as a further safety enhancement. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/isdn/icn/icn.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/drivers/isdn/icn/icn.c b/drivers/isdn/icn/icn.c
index 53d487f0c79d..6a7447c304ac 100644
--- a/drivers/isdn/icn/icn.c
+++ b/drivers/isdn/icn/icn.c
@@ -1155,7 +1155,7 @@ icn_command(isdn_ctrl *c, icn_card *card)
ulong a;
ulong flags;
int i;
- char cbuf[60];
+ char cbuf[80];
isdn_ctrl cmd;
icn_cdef cdef;
char __user *arg;
@@ -1309,7 +1309,6 @@ icn_command(isdn_ctrl *c, icn_card *card)
break;
if ((c->arg & 255) < ICN_BCH) {
char *p;
- char dial[50];
char dcode[4];
a = c->arg;
@@ -1321,10 +1320,10 @@ icn_command(isdn_ctrl *c, icn_card *card)
} else
/* Normal Dial */
strcpy(dcode, "CAL");
- strcpy(dial, p);
- sprintf(cbuf, "%02d;D%s_R%s,%02d,%02d,%s\n", (int) (a + 1),
- dcode, dial, c->parm.setup.si1,
- c->parm.setup.si2, c->parm.setup.eazmsn);
+ snprintf(cbuf, sizeof(cbuf),
+ "%02d;D%s_R%s,%02d,%02d,%s\n", (int) (a + 1),
+ dcode, p, c->parm.setup.si1,
+ c->parm.setup.si2, c->parm.setup.eazmsn);
i = icn_writecmd(cbuf, strlen(cbuf), 0, card);
}
break;