From b32bc70de7c4a4c07152da31ac1920172f2fc375 Mon Sep 17 00:00:00 2001
From: Michael Drake <michael.drake@codethink.co.uk>
Date: Sat, 5 Nov 2022 11:16:23 +0000
Subject: [PATCH] libnsgif: Update to latest upstream (#3142)

Allows clients to know if the scan encountered a truncated image.
---
 libvips/foreign/libnsgif/README.md | 2 +-
 libvips/foreign/libnsgif/gif.c     | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/libvips/foreign/libnsgif/README.md b/libvips/foreign/libnsgif/README.md
index 3cc64ec3..786739fe 100644
--- a/libvips/foreign/libnsgif/README.md
+++ b/libvips/foreign/libnsgif/README.md
@@ -8,7 +8,7 @@ but within the libvips build system.
 Run `./update.sh` to update this copy of libnsgif from the upstream repo. It
 will also patch libnsgif.c to prevent it modifying the input.
 
-Last updated 4 Nov 2022.
+Last updated 5 Nov 2022.
 
 # To do
 
diff --git a/libvips/foreign/libnsgif/gif.c b/libvips/foreign/libnsgif/gif.c
index 2dc631ee..8655bdbc 100644
--- a/libvips/foreign/libnsgif/gif.c
+++ b/libvips/foreign/libnsgif/gif.c
@@ -1234,7 +1234,7 @@ static nsgif_error nsgif__parse_image_data(
 			/* Check if the frame data runs off the end of the file */
 			if (block_size > len) {
 				frame->lzw_data_length += len;
-				return NSGIF_OK;
+				return NSGIF_ERR_END_OF_DATA;
 			}
 
 			len -= block_size;