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author | Waldemar Brodkorb <wbx@uclibc-ng.org> | 2015-12-22 10:45:51 +0100 |
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committer | Waldemar Brodkorb <wbx@uclibc-ng.org> | 2015-12-22 10:45:51 +0100 |
commit | 6994bbf289dc098d38b27521da3a7431e17736db (patch) | |
tree | 480e9cd96494020896372113547470608a9f978f /libpthread/linuxthreads.old_db/td_thr_tsd.c | |
parent | 836c1a7baa9421c1222e022cdc263d8c1a5a2b14 (diff) |
inet/resolv: Fix broken h_aliases list terminator after 2dab3f5
Commit 2dab3f5a "resolv: tiny shrinkage in /etc/hosts handling" leads to
that read_etc_hosts_r() provide garbage pointer at the end of h_aliases
list if more than four hostnames follow a dotted quad in /etc/hosts
Test-case:
Add following line to /etc/hosts
63.63.0.2 host1 alias2 alias3 alias4 alias5
#include <stdio.h>
#include <errno.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
int main (void)
{
int i;
char *a;
struct hostent *he;
struct in_addr ipv4addr;
inet_pton(AF_INET, "63.63.0.2", &ipv4addr);
he = gethostbyaddr(&ipv4addr, sizeof ipv4addr, AF_INET);
if (he == NULL)
exit(1);
printf("Host name: '%s'\n", he->h_name);
i = 0;
while ((a = he->h_aliases[i]) != NULL) {
printf("Host alias: '%s'\n", a);
++i;
}
return 0;
}
Wrong output:
Host name: 'host1'
Host alias: 'alias2'
Host alias: 'alias3'
Host alias: 'alias4'
Host alias: 'alias5'
Host alias: '??'
Signed-off-by: Leonid Lisovskiy <lly.dev@gmail.com>
Signed-off-by: Waldemar Brodkorb <wbx@uclibc-ng.org>
Diffstat (limited to 'libpthread/linuxthreads.old_db/td_thr_tsd.c')
0 files changed, 0 insertions, 0 deletions