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-rw-r--r--libs/libsignal/src/protobuf-c/protobuf-c.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/libs/libsignal/src/protobuf-c/protobuf-c.c b/libs/libsignal/src/protobuf-c/protobuf-c.c
index 4f2f5bcc73..7ea4643c1d 100644
--- a/libs/libsignal/src/protobuf-c/protobuf-c.c
+++ b/libs/libsignal/src/protobuf-c/protobuf-c.c
@@ -2456,10 +2456,11 @@ parse_required_member(ScannedMember *scanned_member,
return FALSE;
def_mess = scanned_member->field->default_value;
- subm = protobuf_c_message_unpack(scanned_member->field->descriptor,
- allocator,
- len - pref_len,
- data + pref_len);
+ if (len >= pref_len)
+ subm = protobuf_c_message_unpack(scanned_member->field->descriptor,
+ allocator,
+ len - pref_len,
+ data + pref_len);
if (maybe_clear &&
*pmessage != NULL &&