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-rw-r--r--erts/emulator/beam/beam_load.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/erts/emulator/beam/beam_load.c b/erts/emulator/beam/beam_load.c
index 8d7beb4eb4..282aa71109 100644
--- a/erts/emulator/beam/beam_load.c
+++ b/erts/emulator/beam/beam_load.c
@@ -3172,7 +3172,11 @@ gen_increment_from_minus(LoaderState* stp, GenOpArg Reg, GenOpArg Integer,
static int
negation_is_small(LoaderState* stp, GenOpArg Int)
{
- return Int.type == TAG_i && IS_SSMALL(-Int.val);
+ /* Check for the rare case of overflow in BeamInstr (UWord) -> Sint
+ * Cast to the correct type before using IS_SSMALL (Sint) */
+ return Int.type == TAG_i &&
+ !(Int.val & ~((((BeamInstr)1) << ((sizeof(Sint)*8)-1))-1)) &&
+ IS_SSMALL(-((Sint)Int.val));
}