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add some check before accessing data:

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- if section header table is be present
 - consistency of section header table size

ok miod@
This commit is contained in:
semarie 2015-06-23 13:43:08 +00:00
parent f47663ad1a
commit 642c3e06fd
1 changed files with 11 additions and 1 deletions
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12
usr.bin/nm/elf.c
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@ -1,4 +1,4 @@
/* $OpenBSD: elf.c,v 1.28 2015/05/17 20:19:08 guenther Exp $ */
/* $OpenBSD: elf.c,v 1.29 2015/06/23 13:43:08 semarie Exp $ */
/*
* Copyright (c) 2003 Michael Shalayeff
@ -149,6 +149,16 @@ elf_load_shdrs(const char *name, FILE *fp, off_t foff, Elf_Ehdr *head)
elf_fix_header(head);
if (head->e_shnum == 0) {
warnx("%s: no section header table", name);
return (NULL);
}
if (head->e_shstrndx >= head->e_shnum) {
warnx("%s: inconsistent section header table", name);
return (NULL);
}
if ((shdr = calloc(head->e_shentsize, head->e_shnum)) == NULL) {
warn("%s: malloc shdr", name);
return (NULL);