From fc09e6e252087d2b6b1bec43f8bb1a94ce9cbb40 Mon Sep 17 00:00:00 2001
From: skal <pascal.massimino@gmail.com>
Date: Wed, 7 Feb 2018 13:43:57 -0800
Subject: [PATCH] PNM decoder: prevent unsupported depth=2 PAM case.

Change-Id: I8476818908d71498dd80b07dc255aa008ffd16f5
---
 imageio/pnmdec.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/imageio/pnmdec.c b/imageio/pnmdec.c
index 6c9a156a..8f5a4a00 100644
--- a/imageio/pnmdec.c
+++ b/imageio/pnmdec.c
@@ -117,7 +117,7 @@ static size_t ReadPAMFields(PNMInfo* const info, size_t off) {
     }
   }
   if (!(info->seen_flags & TUPLE_FLAG)) {
-    if (info->depth > 0 && info->depth <= 4) {
+    if (info->depth > 0 && info->depth <= 4 && info->depth != 2) {
       info->seen_flags |= TUPLE_FLAG;
       info->bytes_per_px = info->depth * (info->max_value > 255 ? 2 : 1);
     } else {
@@ -165,7 +165,7 @@ static size_t ReadHeader(PNMInfo* const info) {
   // perform some basic numerical validation
   if (info->width <= 0 || info->height <= 0 ||
       info->type <= 0 || info->type >= 9 ||
-      info->depth <= 0 || info->depth > 4 ||
+      info->depth <= 0 || info->depth == 2 || info->depth > 4 ||
       info->bytes_per_px < info->depth ||
       info->max_value <= 0 || info->max_value >= 65536) {
     return 0;