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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2022-06-14 18:16:46 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2022-06-14 18:16:46 -0400 |
| commit | 12b8fb34a933456ca762c98bc2047e608b7a1079 (patch) | |
| tree | 581aeb124d1dcae03497aef06e5fb898dac98bb2 | |
| parent | d6d9ea0a468bd5a8bf0feb98e41f1ecb4b8a173d (diff) | |
| download | postgresql-12b8fb34a933456ca762c98bc2047e608b7a1079.tar.gz postgresql-12b8fb34a933456ca762c98bc2047e608b7a1079.zip | |
Avoid ecpglib core dump with out-of-order operations.
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
| -rw-r--r-- | src/interfaces/ecpg/ecpglib/connect.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/src/interfaces/ecpg/ecpglib/connect.c b/src/interfaces/ecpg/ecpglib/connect.c index 585f8d0dcdc..20334416250 100644 --- a/src/interfaces/ecpg/ecpglib/connect.c +++ b/src/interfaces/ecpg/ecpglib/connect.c @@ -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 |