From b6671787db5b5d53e065f88e52a35d94cb50504c Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Sat, 15 Dec 2012 00:19:20 +0100
Subject: flashsv2_prime: check block before using it.

Fixes null pointer dereference

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavcodec/flashsv.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'libavcodec/flashsv.c')

diff --git a/libavcodec/flashsv.c b/libavcodec/flashsv.c
index 8448a8c..7855416 100644
--- a/libavcodec/flashsv.c
+++ b/libavcodec/flashsv.c
@@ -126,6 +126,9 @@ static int flashsv2_prime(FlashSVContext *s, uint8_t *src, int size)
     z_stream zs;
     int zret; // Zlib return code
 
+    if (!src)
+        return AVERROR_INVALIDDATA;
+
     zs.zalloc = NULL;
     zs.zfree  = NULL;
     zs.opaque = NULL;
-- 
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