Ensure maxlen is at leat 1 in dict_int
The dict_int text search dictionary template accepts maxlen parameter,
which is then used to cap the length of input strings. The value was
not properly checked, and the code simply does
txt[d->maxlen] = '\0';
to insert a terminator, leading to segfaults with negative values.
This commit simply rejects values less than 1. The issue was there since
dct_int was introduced in 9.3, so backpatch all the way back to 9.4
which is the oldest supported version.
Reported-by: cili
Discussion: https://postgr.es/m/16144-a36a5bef7657047d@postgresql.org
Backpatch-through: 9.4
Branch
------
REL_10_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/46ce37b67a5144458adb0789eb4e9169a61881fd
Modified Files
--------------
contrib/dict_int/dict_int.c | 5 +++++
contrib/dict_int/expected/dict_int.out | 2 ++
contrib/dict_int/sql/dict_int.sql | 2 ++
3 files changed, 9 insertions(+)
