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Diffstat (limited to 'src/backend/nodes/bitmapset.c')
| -rw-r--r-- | src/backend/nodes/bitmapset.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/backend/nodes/bitmapset.c b/src/backend/nodes/bitmapset.c index bf512cf806f..b4ecf0b0390 100644 --- a/src/backend/nodes/bitmapset.c +++ b/src/backend/nodes/bitmapset.c @@ -1343,7 +1343,7 @@ bms_next_member(const Bitmapset *a, int prevbit) * * Returns largest member less than "prevbit", or -2 if there is none. * "prevbit" must NOT be more than one above the highest possible bit that can - * be set at the Bitmapset at its current size. + * be set in the Bitmapset at its current size. * * To ease finding the highest set bit for the initial loop, the special * prevbit value of -1 can be passed to have the function find the highest @@ -1379,6 +1379,10 @@ bms_prev_member(const Bitmapset *a, int prevbit) if (a == NULL || prevbit == 0) return -2; + /* Validate callers didn't give us something out of range */ + Assert(prevbit <= a->nwords * BITS_PER_BITMAPWORD); + Assert(prevbit >= -1); + /* transform -1 to the highest possible bit we could have set */ if (prevbit == -1) prevbit = a->nwords * BITS_PER_BITMAPWORD - 1; |