libpq: Prevent some overflows of int/size_t Several functions could overflow their size calculations, when presented with very large inputs from remote and/or untrusted locations, and then allocate buffers that were too small to hold the intended contents.
Switch from int to size_t where appropriate, and check for overflow conditions when the inputs could have plausibly originated outside of the libpq trust boundary. (Overflows from within the trust boundary are still possible, but these will be fixed separately.) A version of add_size() is ported from the backend to assist with code that performs more complicated concatenation. Reported-by: Aleksey Solovev (Positive Technologies) Reviewed-by: Noah Misch <[email protected]> Reviewed-by: Álvaro Herrera <[email protected]> Security: CVE-2025-12818 Backpatch-through: 13 Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/600086f471a3bb57ff4953accf1d3f8d2efe0201 Modified Files -------------- src/interfaces/libpq/fe-connect.c | 17 +++++- src/interfaces/libpq/fe-exec.c | 101 ++++++++++++++++++++++++++++++------ src/interfaces/libpq/fe-print.c | 61 ++++++++++++++++++++-- src/interfaces/libpq/fe-protocol3.c | 67 ++++++++++++++++++++---- src/interfaces/libpq/libpq-int.h | 11 +++- 5 files changed, 224 insertions(+), 33 deletions(-)
