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

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 <[email protected]>

1 files changed, 7 insertions, 2 deletions

diff --git a/libdw/dwarf_getcfi_elf.c b/libdw/dwarf_getcfi_elf.c
index ba00e05e..a423ef3d 100644
--- a/libdw/dwarf_getcfi_elf.c
+++ b/libdw/dwarf_getcfi_elf.c
@@ -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;
+	    }
 	}
     }