]> git.ipfire.org Git - thirdparty/postgresql.git/commit
Fix numeric_power() when the exponent is INT_MIN.
authorDean Rasheed <dean.a.rasheed@gmail.com>
Tue, 5 Jan 2021 11:02:46 +0000 (11:02 +0000)
committerDean Rasheed <dean.a.rasheed@gmail.com>
Tue, 5 Jan 2021 11:02:46 +0000 (11:02 +0000)
commit9a299dff25a5f945cc2ee0c00b705857f966e169
tree1ae1202706b14ae57f89dbcb5718fca7c883904b
parent0709b644239ea5beeb21a53220c5b8eceae9a317
Fix numeric_power() when the exponent is INT_MIN.

In power_var_int(), the computation of the number of significant
digits to use in the computation used log(Abs(exp)), which isn't safe
because Abs(exp) returns INT_MIN when exp is INT_MIN. Use fabs()
instead of Abs(), so that the exponent is cast to a double before the
absolute value is taken.

Back-patch to 9.6, where this was introduced (by 7d9a4737c2).

Discussion: https://postgr.es/m/CAEZATCVd6pMkz=BrZEgBKyqqJrt2xghr=fNc8+Z=5xC6cgWrWA@mail.gmail.com
src/backend/utils/adt/numeric.c
src/test/regress/expected/numeric.out
src/test/regress/sql/numeric.sql