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Commitd141e74

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Fix old bug in contrib/sslinfo: X509_NAME_to_text freed the BIO_s_mem buffer
it was using too soon. In a situation where pg_do_encoding_conversion isa no-op, this led to garbage data returned.In HEAD, also modify the code that's ensuring null termination to make ita tad more obvious what's happening.
1 parentc5451c2 commitd141e74

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1 file changed

+12
-18
lines changed

1 file changed

+12
-18
lines changed

‎contrib/sslinfo/sslinfo.c‎

Lines changed: 12 additions & 18 deletions
Original file line numberDiff line numberDiff line change
@@ -4,7 +4,7 @@
44
* Written by Victor B. Wagner <vitus@cryptocom.ru>, Cryptocom LTD
55
* This file is distributed under BSD-style license.
66
*
7-
* $PostgreSQL: pgsql/contrib/sslinfo/sslinfo.c,v 1.7 2008/03/25 22:42:42 tgl Exp $
7+
* $PostgreSQL: pgsql/contrib/sslinfo/sslinfo.c,v 1.8 2008/11/10 14:57:38 tgl Exp $
88
*/
99

1010
#include"postgres.h"
@@ -113,9 +113,9 @@ ssl_client_serial(PG_FUNCTION_ARGS)
113113
Datum
114114
ASN1_STRING_to_text(ASN1_STRING*str)
115115
{
116-
BIO*membuf=NULL;
117-
size_tsize,
118-
outlen;
116+
BIO*membuf;
117+
size_tsize;
118+
charnullterm;
119119
char*sp;
120120
char*dp;
121121
text*result;
@@ -125,16 +125,15 @@ ASN1_STRING_to_text(ASN1_STRING *str)
125125
ASN1_STRING_print_ex(membuf,str,
126126
((ASN1_STRFLGS_RFC2253& ~ASN1_STRFLGS_ESC_MSB)
127127
|ASN1_STRFLGS_UTF8_CONVERT));
128-
129-
outlen=0;
130-
BIO_write(membuf,&outlen,1);
128+
/* ensure null termination of the BIO's content */
129+
nullterm='\0';
130+
BIO_write(membuf,&nullterm,1);
131131
size=BIO_get_mem_data(membuf,&sp);
132132
dp= (char*)pg_do_encoding_conversion((unsignedchar*)sp,
133133
size-1,
134134
PG_UTF8,
135135
GetDatabaseEncoding());
136136
result=cstring_to_text(dp);
137-
138137
if (dp!=sp)
139138
pfree(dp);
140139
BIO_free(membuf);
@@ -271,6 +270,7 @@ X509_NAME_to_text(X509_NAME *name)
271270
ASN1_STRING*v;
272271
constchar*field_name;
273272
size_tsize;
273+
charnullterm;
274274
char*sp;
275275
char*dp;
276276
text*result;
@@ -290,24 +290,18 @@ X509_NAME_to_text(X509_NAME *name)
290290
|ASN1_STRFLGS_UTF8_CONVERT));
291291
}
292292

293-
i=0;
294-
BIO_write(membuf,&i,1);
293+
/* ensure null termination of the BIO's content */
294+
nullterm='\0';
295+
BIO_write(membuf,&nullterm,1);
295296
size=BIO_get_mem_data(membuf,&sp);
296-
297297
dp= (char*)pg_do_encoding_conversion((unsignedchar*)sp,
298298
size-1,
299299
PG_UTF8,
300300
GetDatabaseEncoding());
301-
BIO_free(membuf);
302-
303301
result=cstring_to_text(dp);
304-
305-
/*
306-
* pg_do_encoding_conversion has annoying habit of returning source
307-
* pointer
308-
*/
309302
if (dp!=sp)
310303
pfree(dp);
304+
BIO_free(membuf);
311305

312306
PG_RETURN_TEXT_P(result);
313307
}

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