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getcfi_scn_eh_frame: Don't crash and burn when .eh_frame bits aren't there.

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Trying to read non-existing bits sometimes works and normally a sanity
check will fail. But it could also lead to an unexpected crash much later
when trying to use the non-existing data.

Signed-off-by: Mark Wielaard <mjw@redhat.com>
This commit is contained in:
Mark Wielaard
2013-07-02 11:22:35 +02:00
parent 79277076db
commit 5704c8c4fa
2 changed files with 11 additions and 2 deletions
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libdw/ChangeLog
+4
View File
@@ -1,3 +1,7 @@
2013-07-02 Mark Wielaard <mjw@redhat.com>
* dwarf_getcfi_elf.c (getcfi_shdr): Check sh_type == SHT_PROGBITS.
2013-06-26 Mark Wielaard <mjw@redhat.com>
* libdw_visit_scopes.c (__libdw_visit_scopes): Don't reject root
libdw/dwarf_getcfi_elf.c
+7 -2
View File
@@ -280,8 +280,13 @@ getcfi_shdr (Elf *elf, const GElf_Ehdr *ehdr)
hdr_vaddr = shdr->sh_addr;
}
else if (!strcmp (name, ".eh_frame"))
return getcfi_scn_eh_frame (elf, ehdr, scn, shdr,
hdr_scn, hdr_vaddr);
{
if (shdr->sh_type == SHT_PROGBITS)
return getcfi_scn_eh_frame (elf, ehdr, scn, shdr,
hdr_scn, hdr_vaddr);
else
return NULL;
}
}
}