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Fix a stack overrun in ncat's -g option

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Because of the postincrement and <= operators, the parsing could write
as many as 10 struct in_addr into an array allocated for only 8.
Execution would stop because of a later check. Instead, we use
preincrement and < operator to do bounds checking, and check for the
"too many specified" condition with another call to strtok (which should
return NULL if there were no more hops to parse)
This commit is contained in:
dmiller 2014-11-11 22:15:50 +00:00
parent 877eee826c
commit e4417d132e
1 changed files with 2 additions and 2 deletions
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4
ncat/ncat_main.c
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@ -382,8 +382,8 @@ int main(int argc, char *argv[])
a, gai_strerror(rc));
}
o.srcrtes[o.numsrcrtes] = addr.in.sin_addr;
} while (o.numsrcrtes++ <= 8 && (a = strtok(NULL, ",")));
if (o.numsrcrtes > 8)
} while (++o.numsrcrtes < 8 && (a = strtok(NULL, ",")));
if (strtok(NULL, ","))
bye("Sorry, you gave too many source route hops.");
break;
}