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@xxxxxxxxxx>
---
v2: update changelog.
diff --git a/drivers/isdn/icn/icn.c b/drivers/isdn/icn/icn.c
index 53d487f..88c0603 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;
--
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