[Bug ld/26554] New: SIGSEGV in pe_dll_generate_implib

[markus.boeck02 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26554

            Bug ID: 26554
           Summary: SIGSEGV in pe_dll_generate_implib
           Product: binutils
           Version: 2.36 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: markus.boeck02 at gmail dot com
  Target Milestone: ---

Current HEAD of the repository (42afa120eb180bce52c692939cd179e3c02160d9)
causes a segmentation fault when --out-implib is specified on the command line.
The simplest reproduction is to take any C source file that has eg. an empty
main in it and compile it with the command:

gcc main.c -Wl,--out-implib,libout.dll.a

with a gcc that targets a MinGW target.

The SIGSEGV is caused by the dll_filename variable being NULL at the call to
xstrdup in pe-dll.c:2823

The backtrace generated by gdb is:
#0  0x00007ff9e320d2f1 in strlen () from C:\WINDOWS\System32\msvcrt.dll
#1  0x00000000005600c7 in xstrdup (s=0x0) at ../../libiberty/xstrdup.c:33
#2  0x000000000043f41c in pep_dll_generate_implib (def=0x60148d0,
impfilename=0x1797c0 "libcmTC_3e257.dll.a", info=0x6158e0 <link_info>) at
../../ld/pe-dll.c:2823
#3  0x0000000000430984 in gld_i386pep_finish () at ei386pep.c:1775
#4  0x0000000000425cda in ldemul_finish () at ../../ld/ldemul.c:101
#5  0x000000000041ae46 in lang_process () at ../../ld/ldlang.c:8185
#6  0x000000000041f4d8 in main (argc=71, argv=0x1725a0) at
../../ld/ldmain.c:494
#7  0x0000000000401434 in __tmainCRTStartup () at ../crt/crtexe.c:335
#8  0x000000000040113d in mainCRTStartup () at ../crt/crtexe.c:219

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