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From: "Mikhail T." <mi+thun@aldan.algebra.com>
Subject: Re: bin/175491: elf_getdata may return NULL without setting
 error-message
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The following reply was made to PR bin/175491; it has been noted by GNATS.

From: "Mikhail T." <mi+thun@aldan.algebra.com>
To: bug-followup@FreeBSD.org, mi@aldan.algebra.com
Cc:  
Subject: Re: bin/175491: elf_getdata may return NULL without setting error-message
Date: Mon, 21 Jan 2013 17:23:27 -0500

 This is a multi-part message in MIME format.
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 Content-Type: text/plain; charset=ISO-8859-1; format=flowed
 Content-Transfer-Encoding: 7bit
 
 The test-program...
 
 --------------090000090100000008010002
 Content-Type: text/plain; charset=KOI8-U;
  name="libelftest.c"
 Content-Transfer-Encoding: 7bit
 Content-Disposition: attachment;
  filename="libelftest.c"
 
 #include <err.h>
 #include <fcntl.h>
 #include <libelf.h>
 #include <stdio.h>
 #include <sysexits.h>
 #include <unistd.h>
 
 int
 main(int argc, char *argv[])
 {
 	int	 	 fd;
 	Elf		*elf;
 	Elf_Scn		*scn;
 	Elf_Data	*data;
 	unsigned int	 elfversion;
 
 	elfversion = elf_version(EV_CURRENT);
 	printf("elfversion returned %u\n", elfversion);
 
 	fd = open(argv[argc-1], O_RDONLY);
 	if (fd == -1)
 		err(EX_NOINPUT, "%s", argv[argc-1]);
 
 	elf = elf_begin(fd, ELF_C_READ, NULL);
 	if (elf == NULL)
 		errx(EX_DATAERR, "%s: %s: %s", argv[argc-1], "elf_begin",
 		    elf_errmsg(elf_errno()));
 
 	/*
 	 * Section 0:
 	 */
 	scn = elf_getscn(elf, 0);
 	if (scn == NULL)
 		errx(EX_DATAERR, "%s: %s: %s", argv[argc-1], "elf_getscn",
 		    elf_errmsg(elf_errno()));
 	data = elf_getdata(scn, NULL);
 	if (data == NULL)
 		warnx("%s: %s: %s", argv[argc-1], "elf_getscn",
 		    elf_errmsg(elf_errno()));
 
 	/*
 	 * Enumerate through valid sections
 	 */
 	for (scn = elf_nextscn(elf, NULL); scn; scn = elf_nextscn(elf, scn)) {
 		data = elf_getdata(scn, NULL);
 		if (data == NULL) {
 			int		 errnum;
 			const char	*msg;
 
 			errnum = elf_errno();
 			msg = errnum ? elf_errmsg(errnum) : "errnum was zero";
 			if (errnum && msg)
 				printf("Section %zd has no data: %s\n",
 				    elf_ndxscn(scn), msg);
 			else
 				warnx("Section %zd: elf_getdata() return NULL "
 				    "without explanation", elf_ndxscn(scn));
 		} else {
 			printf("Section %zd has data %p\n",
 			    elf_ndxscn(scn), data);
 		}
 	}
 	return EX_OK;
 }
 
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