[Elftoolchain-developers] Fix seg fault in readelf

[Sunil N. <su...@su...>]

Hello,

According to elf_getdata(3) d_buf can be NULL. This diff checks for
d_buf while doing a str_dump. This fixes a crash when dumping .bss in
readelf.

readelf -p23 readlelf

Index: readelf.c
===================================================================
--- readelf.c	(revision 2487)
+++ readelf.c	(working copy)
@@ -5972,7 +5972,7 @@
 				    elf_errmsg(elferr));
 			continue;
 		}
-		if (d->d_size <= 0)
+		if ((d->d_size <= 0) || (d->d_buf == NULL))
 			continue;
 		buf_end = (unsigned char *) d->d_buf + d->d_size;
 		start = (unsigned char *) d->d_buf;