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Minor cleanup/future-proofing for pg_saslprep(). 

Ensure that pg_saslprep() initializes its output argument to NULL in
all failure paths, and then remove the redundant initialization that
some (not all) of its callers did.  This does not fix any live bug,
but it reduces the odds of future bugs of omission.

Also add a comment about why the existing failure-path coding is
adequate.

Back-patch so as to keep the function's API consistent across branches,
again to forestall future bug introduction.

Patch by me, reviewed by Michael Paquier

Discussion: https://postgr.es/m/16558.1536407783@sss.pgh.pa.us
This commit is contained in:
Tom Lane 2018-09-08 18:20:36 -04:00
parent 9226a3b89b
commit f47f314801
3 changed files with 12 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/backend/libpq/auth-scram.c
View File

@ -453,7 +453,7 @@ pg_be_scram_exchange(void *opaq, char *input, int inputlen,
char *
pg_be_scram_build_verifier(const char *password)
{
char *prep_password = NULL;
char *prep_password;
pg_saslprep_rc rc;
char saltbuf[SCRAM_DEFAULT_SALT_LEN];
char *result;
@ -499,7 +499,7 @@ scram_verify_plain_password(const char *username, const char *password,
uint8 stored_key[SCRAM_KEY_LEN];
uint8 server_key[SCRAM_KEY_LEN];
uint8 computed_key[SCRAM_KEY_LEN];
char *prep_password = NULL;
char *prep_password;
pg_saslprep_rc rc;
if (!parse_scram_verifier(verifier, &iterations, &encoded_salt,

11
src/common/saslprep.c
View File

@ -1081,6 +1081,9 @@ pg_saslprep(const char *input, char **output)
unsigned char *p;
pg_wchar *wp;
/* Ensure we return *output as NULL on failure */
*output = NULL;
/* Check that the password isn't stupendously long */
if (strlen(input) > MAX_PASSWORD_LENGTH)
{
@ -1112,10 +1115,7 @@ pg_saslprep(const char *input, char **output)
*/
input_size = pg_utf8_string_len(input);
if (input_size < 0)
{
*output = NULL;
return SASLPREP_INVALID_UTF8;
}
input_chars = ALLOC((input_size + 1) * sizeof(pg_wchar));
if (!input_chars)
@ -1246,6 +1246,11 @@ pg_saslprep(const char *input, char **output)
result = ALLOC(result_size + 1);
if (!result)
goto oom;
/*
* There are no error exits below here, so the error exit paths don't need
* to worry about possibly freeing "result".
*/
p = (unsigned char *) result;
for (wp = output_chars; *wp; wp++)
{

4
src/interfaces/libpq/fe-auth-scram.c
View File

@ -477,7 +477,7 @@ build_client_final_message(fe_scram_state *state)
printfPQExpBuffer(&conn->errorMessage,
"channel binding not supported by this build\n");
return NULL;
#endif /* HAVE_PGTLS_GET_PEER_CERTIFICATE_HASH */
#endif /* HAVE_PGTLS_GET_PEER_CERTIFICATE_HASH */
}
#ifdef HAVE_PGTLS_GET_PEER_CERTIFICATE_HASH
else if (conn->ssl_in_use)
@ -747,7 +747,7 @@ verify_server_signature(fe_scram_state *state)
char *
pg_fe_scram_build_verifier(const char *password)
{
char *prep_password = NULL;
char *prep_password;
pg_saslprep_rc rc;
char saltbuf[SCRAM_DEFAULT_SALT_LEN];
char *result;