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Commit313d310

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ecpg: Fix NULL pointer dereference during connection lookup
ECPGconnect() caches established connections to the server, supportingthe case of a NULL connection name when a database name is not specifiedby its caller.A follow-up call to ECPGget_PGconn() to get an established connectionfrom the cached set with a non-NULL name could cause a NULL pointerdereference if a NULL connection was listed in the cache and checked fora match. At least two connections are necessary to reproduce the issue:one with a NULL name and one with a non-NULL name.Author: Aleksander Alekseev <aleksander@tigerdata.com>Discussion:https://postgr.es/m/CAJ7c6TNvFTPUTZQuNAoqgzaSGz-iM4XR61D7vEj5PsQXwg2RyA@mail.gmail.comBackpatch-through: 13
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‎src/interfaces/ecpg/ecpglib/connect.c‎

Lines changed: 6 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -66,7 +66,12 @@ ecpg_get_connection_nr(const char *connection_name)
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for (con=all_connections;con!=NULL;con=con->next)
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{
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if (strcmp(connection_name,con->name)==0)
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/*
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* Check for the case of a NULL connection name, stored as such in
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* the connection information by ECPGconnect() when the database
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* name is not specified by its caller.
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*/
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if (con->name!=NULL&&strcmp(connection_name,con->name)==0)
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break;
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}
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ret=con;

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