ubsan: gas resolve_symbol_value

Avoid signed overflow when resolving constant +/- constant.

diff --git a/gas/symbols.c b/gas/symbols.c
index 02ea741bde2ac941ff098dca31db3aec8ad9d9e6..6a4dea88b8f8544f17c98080e5e26b05b00932b7 100644 (file)
--- a/gas/symbols.c
+++ b/gas/symbols.c
@@ -1729,8 +1729,8 @@ resolve_symbol_value (symbolS *symp)
            case O_bit_or_not:          left |= ~right; break;
            case O_bit_exclusive_or:    left ^= right; break;
            case O_bit_and:             left &= right; break;
-           case O_add:                 left += right; break;
-           case O_subtract:            left -= right; break;
+           case O_add:                 left += (valueT) right; break;
+           case O_subtract:            left -= (valueT) right; break;
            case O_eq:
            case O_ne:
              left = (left == right && seg_left == seg_right