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| author | Nathan Bossart <nathan@postgresql.org> | 2024-07-23 21:59:02 -0500 |
|---|---|---|
| committer | Nathan Bossart <nathan@postgresql.org> | 2024-07-23 21:59:02 -0500 |
| commit | 670fb9f187cd75b6928cc044897a1f468439e19d (patch) | |
| tree | a6f45318b66f8308b7be4ac4c2cc8998f9bec472 /src/backend/utils/adt/arrayfuncs.c | |
| parent | 30281db50108468a18e0a8ad5eb83e5367472f2b (diff) | |
| download | postgresql-670fb9f187cd75b6928cc044897a1f468439e19d.tar.gz postgresql-670fb9f187cd75b6928cc044897a1f468439e19d.zip | |
Detect integer overflow in array_set_slice().
When provided an empty initial array, array_set_slice() fails to
check for overflow when computing the new array's dimensions.
While such overflows are ordinarily caught by ArrayGetNItems(),
commands with the following form are accepted:
INSERT INTO t (i[-2147483648:2147483647]) VALUES ('{}');
To fix, perform the hazardous computations using overflow-detecting
arithmetic routines. As with commit 18b585155a, the added test
cases generate errors that include a platform-dependent value, so
we again use psql's VERBOSITY parameter to suppress printing the
message text.
Reported-by: Alexander Lakhin
Author: Joseph Koshakow
Reviewed-by: Jian He
Discussion: https://postgr.es/m/31ad2cd1-db94-bdb3-f91a-65ffdb4bef95%40gmail.com
Backpatch-through: 12
Diffstat (limited to 'src/backend/utils/adt/arrayfuncs.c')
| -rw-r--r-- | src/backend/utils/adt/arrayfuncs.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/src/backend/utils/adt/arrayfuncs.c b/src/backend/utils/adt/arrayfuncs.c index 0071f7d2f4c..ce659b554ef 100644 --- a/src/backend/utils/adt/arrayfuncs.c +++ b/src/backend/utils/adt/arrayfuncs.c @@ -2899,7 +2899,14 @@ array_set_slice(Datum arraydatum, errdetail("When assigning to a slice of an empty array value," " slice boundaries must be fully specified."))); - dim[i] = 1 + upperIndx[i] - lowerIndx[i]; + /* compute "upperIndx[i] - lowerIndx[i] + 1", detecting overflow */ + if (pg_sub_s32_overflow(upperIndx[i], lowerIndx[i], &dim[i]) || + pg_add_s32_overflow(dim[i], 1, &dim[i])) + ereport(ERROR, + (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED), + errmsg("array size exceeds the maximum allowed (%d)", + (int) MaxArraySize))); + lb[i] = lowerIndx[i]; } |