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| author | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2020-12-01 11:46:56 -0300 |
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| committer | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2020-12-01 11:46:56 -0300 |
| commit | f0ff52f25cb9773de67303a77e6afe3b8a2c4d48 (patch) | |
| tree | cb2e979509fc4252747ceec41e7b817a1abad468 /src/backend/parser/parse_utilcmd.c | |
| parent | 50f338574242be955c79ed0b3e193ce3ff4cd5eb (diff) | |
| download | postgresql-f0ff52f25cb9773de67303a77e6afe3b8a2c4d48.tar.gz postgresql-f0ff52f25cb9773de67303a77e6afe3b8a2c4d48.zip | |
Avoid memcpy() with a NULL source pointer and count == 0
When memcpy() is called on a pointer, the compiler is entitled to assume
that the pointer is not null, which can lead to optimizing nearby code
in potentially undesirable ways. We still want such optimizations
(gcc's -fdelete-null-pointer-checks) in cases where they're valid.
Related: commit 13bba02271dc.
Backpatch to pg11, where this particular instance appeared.
Reported-by: Ranier Vilela <ranier.vf@gmail.com>
Reported-by: Zhihong Yu <zyu@yugabyte.com>
Discussion: https://postgr.es/m/CAEudQApUndmQkr5fLrCKXQ7+ib44i7S+Kk93pyVThS85PnG3bQ@mail.gmail.com
Discussion: https://postgr.es/m/CALNJ-vSdhwSM5f4tnNn1cdLHvXMVe_S+V3nR5GwNrmCPNB2VtQ@mail.gmail.com
Diffstat (limited to 'src/backend/parser/parse_utilcmd.c')
0 files changed, 0 insertions, 0 deletions