hstore: Fix NULL pointer dereference with receive function
The receive function of hstore was not able to handle correctly
duplicate key values when a new duplicate links to a NULL value, where a
pfree() could be attempted on a NULL pointer, crashing due to a pointer
dereference.
This problem would happen for a COPY BINARY, when stacking values like
that:
aa => 5
aa => null
The second key/value pair is discarded and pfree() calls are attempted
on its key and its value, leading to a pointer dereference for the value
part as the value is NULL. The first key/value pair takes priority when
a duplicate is found.
Per offline report.
Reported-by: "Anemone" <vergissmeinnichtzh@gmail.com>
Reported-by: "A1ex" <alex000young@gmail.com>
Backpatch-through: 14
Branch
------
REL_18_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/4a0843c539018a1aad22a3ec8209b0ff1697b65d
Modified Files
--------------
contrib/hstore/hstore_io.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
