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Bridges: fix an out-of-bounds read.

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Occurs when dragging from an island next to an edge in the direction
of that edge.

This bug was discovered using ASan.
This commit is contained in:
Evgeny Kapun
2024-11-04 13:59:43 +00:00
committed by Simon Tatham
parent 05f4f6349f
commit ebb50f0af2
1 changed files with 4 additions and 0 deletions
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4
bridges.c
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@ -2306,11 +2306,15 @@ static char *update_drag_dst(const game_state *state, game_ui *ui,
if (abs(nx-ox) < abs(ny-oy)) {
dx = 0;
dy = (ny-oy) < 0 ? -1 : 1;
if (!INGRID(state, ui->dragx_src+dx, ui->dragy_src+dy))
return MOVE_UI_UPDATE;
gtype = G_LINEV; ntype = G_NOLINEV; mtype = G_MARKV;
maxb = INDEX(state, maxv, ui->dragx_src+dx, ui->dragy_src+dy);
} else {
dy = 0;
dx = (nx-ox) < 0 ? -1 : 1;
if (!INGRID(state, ui->dragx_src+dx, ui->dragy_src+dy))
return MOVE_UI_UPDATE;
gtype = G_LINEH; ntype = G_NOLINEH; mtype = G_MARKH;
maxb = INDEX(state, maxh, ui->dragx_src+dx, ui->dragy_src+dy);
}