From 190a0998c353879c8f79f47678752dbb8fa62bb2 Mon Sep 17 00:00:00 2001
From: Carl Eugen Hoyos <cehoyos@ag.or.at>
Date: Wed, 28 Dec 2011 05:59:39 +0100
Subject: [PATCH] Fix a crash when reading gray pam files.

Fixes ticket #837.
---
 libavcodec/pnm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavcodec/pnm.c b/libavcodec/pnm.c
index 09530f8131..680034a3d5 100644
--- a/libavcodec/pnm.c
+++ b/libavcodec/pnm.c
@@ -109,6 +109,7 @@ int ff_pnm_decode_header(AVCodecContext *avctx, PNMContext * const s)
 
         avctx->width  = w;
         avctx->height = h;
+        s->maxval     = maxval;
         if (depth == 1) {
             if (maxval == 1)
                 avctx->pix_fmt = PIX_FMT_MONOWHITE;