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Commit8d0df20

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Fix write-past-buffer-end in ldapServiceLookup().
The code to assemble ldap_get_values_len's output into a single stringwrote the terminating null one byte past where it should. Fix that,and make some other cosmetic adjustments to make the code a trifle morereadable and more in line with usual Postgres coding style.Also, free the "result" string when done with it, to avoid a permanentmemory leak.Bug report and patch by Albe Laurenz, cosmetic adjustments by me.
1 parentc6eb574 commit8d0df20

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1 file changed

+13
-7
lines changed

1 file changed

+13
-7
lines changed

‎src/interfaces/libpq/fe-connect.c‎

Lines changed: 13 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -3596,25 +3596,26 @@ ldapServiceLookup(const char *purl, PQconninfoOption *options,
35963596
return1;
35973597
}
35983598

3599-
/* concatenate values to a single string */
3600-
for (size=0,i=0;values[i]!=NULL;++i)
3599+
/* concatenate values into a single string with newline terminators */
3600+
size=1;/* for the trailing null */
3601+
for (i=0;values[i]!=NULL;i++)
36013602
size+=values[i]->bv_len+1;
3602-
if ((result=malloc(size+1))==NULL)
3603+
if ((result=malloc(size))==NULL)
36033604
{
36043605
printfPQExpBuffer(errorMessage,
36053606
libpq_gettext("out of memory\n"));
36063607
ldap_value_free_len(values);
36073608
ldap_unbind(ld);
36083609
return3;
36093610
}
3610-
for (p=result,i=0;values[i]!=NULL;++i)
3611+
p=result;
3612+
for (i=0;values[i]!=NULL;i++)
36113613
{
3612-
strncpy(p,values[i]->bv_val,values[i]->bv_len);
3614+
memcpy(p,values[i]->bv_val,values[i]->bv_len);
36133615
p+=values[i]->bv_len;
36143616
*(p++)='\n';
3615-
if (values[i+1]==NULL)
3616-
*(p+1)='\0';
36173617
}
3618+
*p='\0';
36183619

36193620
ldap_value_free_len(values);
36203621
ldap_unbind(ld);
@@ -3643,6 +3644,7 @@ ldapServiceLookup(const char *purl, PQconninfoOption *options,
36433644
printfPQExpBuffer(errorMessage,libpq_gettext(
36443645
"missing \"=\" after \"%s\" in connection info string\n"),
36453646
optname);
3647+
free(result);
36463648
return3;
36473649
}
36483650
elseif (*p=='=')
@@ -3661,6 +3663,7 @@ ldapServiceLookup(const char *purl, PQconninfoOption *options,
36613663
printfPQExpBuffer(errorMessage,libpq_gettext(
36623664
"missing \"=\" after \"%s\" in connection info string\n"),
36633665
optname);
3666+
free(result);
36643667
return3;
36653668
}
36663669
break;
@@ -3724,6 +3727,7 @@ ldapServiceLookup(const char *purl, PQconninfoOption *options,
37243727
printfPQExpBuffer(errorMessage,
37253728
libpq_gettext("invalid connection option \"%s\"\n"),
37263729
optname);
3730+
free(result);
37273731
return1;
37283732
}
37293733
optname=NULL;
@@ -3732,6 +3736,8 @@ ldapServiceLookup(const char *purl, PQconninfoOption *options,
37323736
oldstate=state;
37333737
}
37343738

3739+
free(result);
3740+
37353741
if (state==5||state==6)
37363742
{
37373743
printfPQExpBuffer(errorMessage,libpq_gettext(

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