rhbz1991997

commit 212576147 (refs/bisect/new)

Author: Xiaozhu Meng <mxz297@gmail.com>

Date:   Wed May 26 11:26:28 2021 -0500

    Skip parsing of blocks whose code buffer is null (#1033)

--- dyninst-11.0.0/parseAPI/src/Parser.C.orig

+++ dyninst-11.0.0/parseAPI/src/Parser.C

@@ -1703,6 +1703,14 @@ Parser::parse_frame_one_iteration(ParseFrame &frame, bool recursive) {

             cur->region()->offset() + cur->region()->length() - curAddr;

         const unsigned char* bufferBegin =

             (const unsigned char *)(func->region()->getPtrToInstruction(curAddr));

+        if (bufferBegin == nullptr) {

+            // This can happen if jump table is over-approxiated.

+            // We ignore this block for now, and later the over-approximated block

+            // will be removed.

+            parsing_printf("\taddress %lx in a different region from the funcion entry at %lx, skip parsing\n", curAddr, func->addr());

+            continue;

+        }

+

         InstructionDecoder dec(bufferBegin,size,frame.codereg->getArch());

         if (!ahPtr)