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Fix write-past-buffer-end in ldapServiceLookup(). 

The code to assemble ldap_get_values_len's output into a single string
wrote the terminating null one byte past where it should.  Fix that,
and make some other cosmetic adjustments to make the code a trifle more
readable and more in line with usual Postgres coding style.

Also, free the "result" string when done with it, to avoid a permanent
memory leak.

Bug report and patch by Albe Laurenz, cosmetic adjustments by me.
This commit is contained in:
Tom Lane 2011-05-12 11:56:38 -04:00
parent c01da31713
commit 3b65ffa2bf
1 changed files with 13 additions and 7 deletions
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20
src/interfaces/libpq/fe-connect.c
View File

@ -2728,10 +2728,11 @@ ldapServiceLookup(const char *purl, PQconninfoOption *options,
return 1;
}
/* concatenate values to a single string */
for (size = 0, i = 0; values[i] != NULL; ++i)
/* concatenate values into a single string with newline terminators */
size = 1; /* for the trailing null */
for (i = 0; values[i] != NULL; i++)
size += values[i]->bv_len + 1;
if ((result = malloc(size + 1)) == NULL)
if ((result = malloc(size)) == NULL)
{
printfPQExpBuffer(errorMessage,
libpq_gettext("out of memory\n"));
@ -2739,14 +2740,14 @@ ldapServiceLookup(const char *purl, PQconninfoOption *options,
ldap_unbind(ld);
return 3;
}
for (p = result, i = 0; values[i] != NULL; ++i)
p = result;
for (i = 0; values[i] != NULL; i++)
{
strncpy(p, values[i]->bv_val, values[i]->bv_len);
memcpy(p, values[i]->bv_val, values[i]->bv_len);
p += values[i]->bv_len;
*(p++) = '\n';
if (values[i + 1] == NULL)
*(p + 1) = '\0';
}
*p = '\0';
ldap_value_free_len(values);
ldap_unbind(ld);
@ -2775,6 +2776,7 @@ ldapServiceLookup(const char *purl, PQconninfoOption *options,
printfPQExpBuffer(errorMessage, libpq_gettext(
"missing \"=\" after \"%s\" in connection info string\n"),
optname);
free(result);
return 3;
}
else if (*p == '=')
@ -2793,6 +2795,7 @@ ldapServiceLookup(const char *purl, PQconninfoOption *options,
printfPQExpBuffer(errorMessage, libpq_gettext(
"missing \"=\" after \"%s\" in connection info string\n"),
optname);
free(result);
return 3;
}
break;
@ -2856,6 +2859,7 @@ ldapServiceLookup(const char *purl, PQconninfoOption *options,
printfPQExpBuffer(errorMessage,
libpq_gettext("invalid connection option \"%s\"\n"),
optname);
free(result);
return 1;
}
optname = NULL;
@ -2864,6 +2868,8 @@ ldapServiceLookup(const char *purl, PQconninfoOption *options,
oldstate = state;
}
free(result);
if (state == 5 || state == 6)
{
printfPQExpBuffer(errorMessage, libpq_gettext(