Bug 693639: plug various memory leaks.

Thanks to zeniko.

Also ensure that pdf_free_annot copes with NULL.

5 files changed, 46 insertions, 24 deletions

diff --git a/pdf/pdf_annot.c b/pdf/pdf_annot.c
index 32de1eb9..01140048 100644
--- a/pdf/pdf_annot.c
+++ b/pdf/pdf_annot.c
@@ -295,8 +295,16 @@ pdf_load_link_annots(pdf_document *xref, pdf_obj *annots, const fz_matrix *page_
 	n = pdf_array_len(annots);
 	for (i = 0; i < n; i++)
 	{
-		obj = pdf_array_get(annots, i);
-		link = pdf_load_link(xref, obj, page_ctm);
+		fz_try(xref->ctx)
+		{
+			obj = pdf_array_get(annots, i);
+			link = pdf_load_link(xref, obj, page_ctm);
+		}
+		fz_catch(xref->ctx)
+		{
+			link = NULL;
+		}
+
 		if (link)
 		{
 			if (!head)
@@ -317,7 +325,7 @@ pdf_free_annot(fz_context *ctx, pdf_annot *annot)
 {
 	pdf_annot *next;
 
-	do
+	while (annot)
 	{
 		next = annot->next;
 		if (annot->ap)
@@ -326,7 +334,6 @@ pdf_free_annot(fz_context *ctx, pdf_annot *annot)
 		fz_free(ctx, annot);
 		annot = next;
 	}
-	while (annot);
 }
 
 static void
@@ -366,13 +373,20 @@ pdf_load_annots(pdf_document *xref, pdf_obj *annots, pdf_page *page)
 	len = pdf_array_len(annots);
 	for (i = 0; i < len; i++)
 	{
-		obj = pdf_array_get(annots, i);
+		fz_try(ctx)
+		{
+			obj = pdf_array_get(annots, i);
 
-		pdf_update_appearance(xref, obj);
+			pdf_update_appearance(xref, obj);
 
-		rect = pdf_dict_gets(obj, "Rect");
-		ap = pdf_dict_gets(obj, "AP");
-		as = pdf_dict_gets(obj, "AS");
+			rect = pdf_dict_gets(obj, "Rect");
+			ap = pdf_dict_gets(obj, "AP");
+			as = pdf_dict_gets(obj, "AS");
+		}
+		fz_catch(ctx)
+		{
+			ap = NULL;
+		}
 
 		if (!pdf_is_dict(ap))
 			continue;
@@ -429,7 +443,7 @@ pdf_load_annots(pdf_document *xref, pdf_obj *annots, pdf_page *page)
 		}
 		fz_catch(ctx)
 		{
-			fz_free(ctx, annot);
+			pdf_free_annot(ctx, annot);
 			fz_warn(ctx, "ignoring broken annotation");
 		}
 	}
diff --git a/pdf/pdf_colorspace.c b/pdf/pdf_colorspace.c
index 14dc5337..7b0ba7c3 100644
--- a/pdf/pdf_colorspace.c
+++ b/pdf/pdf_colorspace.c
@@ -259,23 +259,21 @@ load_indexed(pdf_document *xref, pdf_obj *array)
 		{
 			fz_stream *file = NULL;
 
+			fz_var(file);
+
 			fz_try(ctx)
 			{
 				file = pdf_open_stream(xref, pdf_to_num(lookup), pdf_to_gen(lookup));
+				i = fz_read(file, idx->lookup, n);
 			}
-			fz_catch(ctx)
+			fz_always(ctx)
 			{
-				fz_throw(ctx, "cannot open colorspace lookup table (%d 0 R)", pdf_to_num(lookup));
+				fz_close(file);
 			}
-
-			i = fz_read(file, idx->lookup, n);
-			if (i < 0)
+			fz_catch(ctx)
 			{
-				fz_close(file);
-				fz_throw(ctx, "cannot read colorspace lookup table (%d 0 R)", pdf_to_num(lookup));
+				fz_throw(ctx, "cannot open colorspace lookup table (%d 0 R)", pdf_to_num(lookup));
 			}
-
-			fz_close(file);
 		}
 		else
 		{
diff --git a/pdf/pdf_outline.c b/pdf/pdf_outline.c
index d92f3fbd..3a0e803e 100644
--- a/pdf/pdf_outline.c
+++ b/pdf/pdf_outline.c
@@ -10,6 +10,7 @@ pdf_load_outline_imp(pdf_document *xref, pdf_obj *dict)
 	pdf_obj *odict = dict;
 
 	fz_var(dict);
+	fz_var(first);
 
 	fz_try(ctx)
 	{
@@ -50,6 +51,7 @@ pdf_load_outline_imp(pdf_document *xref, pdf_obj *dict)
 	}
 	fz_catch(ctx)
 	{
+		fz_free_outline(ctx, first);
 		fz_rethrow(ctx);
 	}
 
diff --git a/pdf/pdf_repair.c b/pdf/pdf_repair.c
index be3779d2..c74f25af 100644
--- a/pdf/pdf_repair.c
+++ b/pdf/pdf_repair.c
@@ -310,7 +310,7 @@ pdf_repair_xref(pdf_document *xref, pdf_lexbuf *buf)
 					break;
 				}
 
-				if (num < 0)
+				if (num <= 0)
 				{
 					fz_warn(ctx, "ignoring object with invalid object number (%d %d R)", num, gen);
 					continue;
diff --git a/pdf/pdf_stream.c b/pdf/pdf_stream.c
index 77bf7c64..2639c9e1 100644
--- a/pdf/pdf_stream.c
+++ b/pdf/pdf_stream.c
@@ -268,10 +268,18 @@ pdf_open_filter(fz_stream *chain, pdf_document *xref, pdf_obj *stmobj, int num,
 
 	chain = pdf_open_raw_filter(chain, xref, stmobj, num, num, gen, offset);
 
-	if (pdf_is_name(filters))
-		chain = build_filter(chain, xref, filters, params, num, gen, imparams);
-	else if (pdf_array_len(filters) > 0)
-		chain = build_filter_chain(chain, xref, filters, params, num, gen, imparams);
+	fz_try(xref->ctx)
+	{
+		if (pdf_is_name(filters))
+			chain = build_filter(chain, xref, filters, params, num, gen, imparams);
+		else if (pdf_array_len(filters) > 0)
+			chain = build_filter_chain(chain, xref, filters, params, num, gen, imparams);
+	}
+	fz_catch(xref->ctx)
+	{
+		fz_close(chain);
+		fz_rethrow(xref->ctx);
+	}
 
 	return chain;
 }