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From: Noah Misch <[email protected]>
To: [email protected]
Subject: pgsql: Avoid overflow in size calculations in formatting.c.
Date: Mon, 11 May 2026 12:19:37 +0000
Message-ID: <[email protected]> (raw)

Avoid overflow in size calculations in formatting.c.

A few functions in this file were incautious about multiplying a
possibly large integer by a factor more than 1 and then using it as
an allocation size.  This is harmless on 64-bit systems where we'd
compute a size exceeding MaxAllocSize and then fail, but on 32-bit
systems we could overflow size_t, leading to an undersized
allocation and buffer overrun.  To fix, use palloc_array() or
mul_size() instead of handwritten multiplication.

Reported-by: Sven Klemm <[email protected]>
Reported-by: Xint Code
Author: Nathan Bossart <[email protected]>
Reviewed-by: Tom Lane <[email protected]>
Reviewed-by: Tatsuo Ishii <[email protected]>
Security: CVE-2026-6473
Backpatch-through: 14

Branch
------
REL_18_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/55328e3a98df0fb5aad17f7f9aec64954462c871
Author: Nathan Bossart <[email protected]>

Modified Files
--------------
src/backend/utils/adt/formatting.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

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