[Bug binutils/31314] New: chew crashing on use of uninitialized value

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https://sourceware.org/bugzilla/show_bug.cgi?id=31314

            Bug ID: 31314
           Summary: chew crashing on use of uninitialized value
           Product: binutils
           Version: 2.42
            Status: NEW
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: schwab@linux-m68k.org
  Target Milestone: ---

$ MALLOC_CHECK_=3 doc/chew -f ../../binutils/bfd/doc/proto.str <
../../binutils/bfd/reloc.c 
Segmentation fault (core dumped)
$ valgrind --track-origins=yes doc/chew -f ../../binutils/bfd/doc/proto.str <
../../binutils/bfd/reloc.c > xx
==10810== Memcheck, a memory error detector
==10810== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al.
==10810== Using Valgrind-3.20.0 and LibVEX; rerun with -h for copyright info
==10810== Command: doc/chew -f ../../binutils/bfd/doc/proto.str
==10810== 
==10810== Conditional jump or move depends on uninitialised value(s)
==10810==    at 0x40110F: exec (chew.c:361)
==10810==    by 0x401144: call (chew.c:370)
==10810==    by 0x401101: exec (chew.c:362)
==10810==    by 0x403016: perform (chew.c:1280)
==10810==    by 0x403BB2: main (chew.c:1609)
==10810==  Uninitialised value was created by a heap allocation
==10810==    at 0x483D85F: realloc (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==10810==    by 0x400AF6: xrealloc (chew.c:176)
==10810==    by 0x403170: add_to_definition (chew.c:1314)
==10810==    by 0x40320B: add_intrinsic (chew.c:1329)
==10810==    by 0x403A08: main (chew.c:1573)
==10810== 
==10810== 
==10810== HEAP SUMMARY:
==10810==     in use at exit: 160,472 bytes in 2 blocks
==10810==   total heap usage: 28,310 allocs, 28,308 frees, 123,451,337 bytes
allocated
==10810== 
==10810== LEAK SUMMARY:
==10810==    definitely lost: 0 bytes in 0 blocks
==10810==    indirectly lost: 0 bytes in 0 blocks
==10810==      possibly lost: 0 bytes in 0 blocks
==10810==    still reachable: 160,472 bytes in 2 blocks
==10810==         suppressed: 0 bytes in 0 blocks
==10810== Rerun with --leak-check=full to see details of leaked memory
==10810== 
==10810== For lists of detected and suppressed errors, rerun with: -s
==10810== ERROR SUMMARY: 596 errors from 1 contexts (suppressed: 0 from 0)

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