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-rw-r--r--erts/emulator/beam/io.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/erts/emulator/beam/io.c b/erts/emulator/beam/io.c
index 9bf29ee230..38e403d91a 100644
--- a/erts/emulator/beam/io.c
+++ b/erts/emulator/beam/io.c
@@ -4889,10 +4889,18 @@ erts_port_control(Process* c_p,
copy = 1;
else {
ProcBin *pb = (ProcBin *) ebinp;
+ int offset = bufp - pb->val->orig_bytes;
- if (pb->flags)
+ ASSERT(pb->val->orig_bytes <= bufp
+ && bufp + size <= pb->val->orig_bytes + pb->val->orig_size);
+
+ if (pb->flags) {
erts_emasculate_writable_binary(pb);
+ /* The procbin may have been reallocated, so update bufp */
+ bufp = pb->val->orig_bytes + offset;
+ }
+
binp = pb->val;
ASSERT(bufp <= bufp + size);
ASSERT(binp->orig_bytes <= bufp