From 751baefdff9eca1e959a4a9591683ca1fe4da2da Mon Sep 17 00:00:00 2001
From: Xerbo <xerbo@protonmail.com>
Date: Tue, 23 Jun 2020 13:08:39 +0100
Subject: [PATCH] Close file stream if libpng fails to init

---
 pngio.c | 30 ++++++++++++++++++++++++------
 1 file changed, 24 insertions(+), 6 deletions(-)

diff --git a/pngio.c b/pngio.c
index 5679748..419647c 100644
--- a/pngio.c
+++ b/pngio.c
@@ -40,9 +40,15 @@ int mapOverlay(char *filename, rgb_t **crow, int nrow, int zenith, int MCIR) {
 
 	// Create reader
 	png_structp png = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
-	if(!png) return 0;
+	if(!png) {
+		fclose(fp);
+		return 0;
+	}
 	png_infop info = png_create_info_struct(png);
-	if(!info) return 0;
+	if(!info) {
+		fclose(fp);
+		return 0;
+	}
 	png_init_io(png, fp);
 
 	// Read info from header
@@ -144,9 +150,15 @@ int readRawImage(char *filename, float **prow, int *nrow) {
 
 	// Create reader
 	png_structp png = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
-	if(!png) return 0;
+	if(!png) {
+		fclose(fp);
+		return 0;
+	}
 	png_infop info = png_create_info_struct(png);
-	if(!info) return 0;
+	if(!info) {
+		fclose(fp);
+		return 0;
+	}
 	png_init_io(png, fp);
 
 	// Read info from header
@@ -202,9 +214,15 @@ int readPalette(char *filename, rgb_t **pixels) {
 
 	// Create reader
 	png_structp png = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
-	if(!png) return 0;
+	if(!png) {
+		fclose(fp);
+		return 0;
+	}
 	png_infop info = png_create_info_struct(png);
-	if(!info) return 0;
+	if(!info) {
+		fclose(fp);
+		return 0;
+	}
 	png_init_io(png, fp);
 
 	// Read info from header