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
------
REL9_4_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/44381b1aff0e92acc91381c40f1b07514e93a18b
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(+)
