Be more paranoid about null return values from libpq status functions.
PQhost() can return NULL in non-error situations, namely when a Unix-socket
connection has been selected by default. That behavior is a tad debatable
perhaps, but for the moment we should make sure that psql copes with it.
Unfortunately, do_connect() failed to: it could pass a NULL pointer to
strcmp(), resulting in crashes on most platforms. This was reported as a
security issue by ChenQin of Topsec Security Team, but the consensus of
the security list is that it's just a garden-variety bug with no security
implications.
For paranoia's sake, I made the keep_password test not trust PQuser or
PQport either, even though I believe those will never return NULL given
a valid PGconn.
Back-patch to all supported branches.
Branch
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REL9_5_STABLE
Details
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http://git.postgresql.org/pg/commitdiff/55a2cc844216838d743cae7d94bd4f38acc62d1e
Modified Files
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src/bin/psql/command.c | 21 ++++++++++++---------
1 file changed, 12 insertions(+), 9 deletions(-)