commit 86fecbce404a9379c4e33837101ba43713fcc9bb
from: pompolic <pompolic@special-circumstanc.es>
date: Fri Mar 05 19:58:10 2021 UTC

Merge branch 'fix-aux-xrefs-segfault' into 'master'

Fix segfault when `decode_stream` fails in xrefs

See merge request pesco/pdf!17

commit - 79dc4dd64dee4c459207a6f7c8c1cd18c824fda7
commit + 86fecbce404a9379c4e33837101ba43713fcc9bb
blob - d4b299da2f823e3a5394cfbf9c7ae8860a9fc490
blob + fc41174066a20089dd8043518b6c4f7c3a790484
--- pdf.c
+++ pdf.c
@@ -2359,12 +2359,11 @@ parse_xrefs(const uint8_t *input, size_t sz, size_t *n
 		//res = h_parse(p_xref, input + offset, sz - offset);
 		HParser *p = h_right(h_seek(offset * 8, SEEK_SET), p_xref);	// XXX
 		res = h_parse(p, input, sz);
-		if (res == NULL) {
+		if (res == NULL || res->ast == NULL || H_INDEX_TOKEN(res->ast, 0) == NULL) {
 			fprintf(stderr, "%s: error parsing xref section at "
 			    "position %zu (%#zx)\n", infile, offset, offset);
 			break;
 		}
-		assert(res->ast != NULL);
 
 		/* save this section in xrefs */
 		if (n >= SIZE_MAX / sizeof(HParsedToken *))