upstream/postgresql
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2026-03-19 00:52:42 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

Fix crash in psql when attempting to reuse old connection

Browse source 
In a psql session, if the connection to the server is abruptly cut, the
referenced connection would become NULL as of CheckConnection().  This
could cause a hard crash with psql if attempting to connect by reusing
the past connection's data because of a null-pointer dereference with
either PQhost() or PQdb().  This issue is fixed by making sure that no
reuse of the past connection is done if it does not exist.

Issue has been introduced by 6e5f8d4, so backpatch down to 12.

Reported-by: Hugh Wang
Author: Michael Paquier
Reviewed-by: Álvaro Herrera, Tom Lane
Discussion: https://postgr.es/m/16330-b34835d83619e25d@postgresql.org
Backpatch-through: 12
This commit is contained in:
Michael Paquier 2020-04-01 14:45:57 +09:00
parent 6a50f1af44
commit f79bea4b6b
1 changed files with 5 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
src/bin/psql/command.c
View file

@ -2941,6 +2941,11 @@ do_connect(enum trivalue reuse_previous_specification,
reuse_previous = !has_connection_string;
break;
}
/* If the old connection does not exist, there is nothing to reuse. */
if (!o_conn)
reuse_previous = false;
/* Silently ignore arguments subsequent to a connection string. */
if (has_connection_string)
{