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Avoid ecpglib core dump with out-of-order operations.

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If an application executed operations like EXEC SQL PREPARE
without having first established a database connection, it could
get a core dump instead of the expected clean failure.  This
occurred because we did "pthread_getspecific(actual_connection_key)"
without ever having initialized the TSD key actual_connection_key.
The results of that are probably platform-specific, but at least
on Linux it often leads to a crash.

To fix, add calls to ecpg_pthreads_init() in the code paths that
might use actual_connection_key uninitialized.  It's harmless
(and hopefully inexpensive) to do that more than once.

Per bug #17514 from Okano Naoki.  The problem's ancient, so
back-patch to all supported branches.

Discussion: https://postgr.es/m/17514-edd4fad547c5692c@postgresql.org
This commit is contained in:
Tom Lane 2022-06-14 18:16:46 -04:00
parent d26ac35d0d
commit ba412c905a
1 changed files with 6 additions and 4 deletions
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10
src/interfaces/ecpg/ecpglib/connect.c
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@ -40,6 +40,8 @@ ecpg_get_connection_nr(const char *connection_name)
if ((connection_name == NULL) || (strcmp(connection_name, "CURRENT") == 0))
{
#ifdef ENABLE_THREAD_SAFETY
ecpg_pthreads_init(); /* ensure actual_connection_key is valid */
ret = pthread_getspecific(actual_connection_key);
/*
@ -47,8 +49,7 @@ ecpg_get_connection_nr(const char *connection_name)
* connection and hope the user knows what they're doing (i.e. using
* their own mutex to protect that connection from concurrent accesses
*/
/* if !ret then we got the connection from TSD */
if (NULL == ret)
if (ret == NULL)
/* no TSD connection, going for global */
ret = actual_connection;
#else
@ -78,6 +79,8 @@ ecpg_get_connection(const char *connection_name)
if ((connection_name == NULL) || (strcmp(connection_name, "CURRENT") == 0))
{
#ifdef ENABLE_THREAD_SAFETY
ecpg_pthreads_init(); /* ensure actual_connection_key is valid */
ret = pthread_getspecific(actual_connection_key);
/*
@ -85,8 +88,7 @@ ecpg_get_connection(const char *connection_name)
* connection and hope the user knows what they're doing (i.e. using
* their own mutex to protect that connection from concurrent accesses
*/
/* if !ret then we got the connection from TSD */
if (NULL == ret)
if (ret == NULL)
/* no TSD connection here either, using global */
ret = actual_connection;
#else