From 5e367af7b53b95bf084ded361dfe431c66572150 Mon Sep 17 00:00:00 2001
From: DreamPiggy <lizhuoli1126@126.com>
Date: Tue, 1 Aug 2017 01:34:21 +0800
Subject: [PATCH] Fix CGBitmapContextCreate bitmap memory leak issue

Pass NULL to CGBitmapContextCreate whenever the data param is not used later to reduce memory leak issue
---
 SDWebImage/SDWebImageDecoder.m | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/SDWebImage/SDWebImageDecoder.m b/SDWebImage/SDWebImageDecoder.m
index cf5e6760..eeaac6c3 100644
--- a/SDWebImage/SDWebImageDecoder.m
+++ b/SDWebImage/SDWebImageDecoder.m
@@ -115,16 +115,10 @@ static const CGFloat kDestSeemOverlap = 2.0f;   // the numbers of pixels to over
         
         size_t bytesPerRow = kBytesPerPixel * destResolution.width;
         
-        // Allocate enough pixel data to hold the output image.
-        void* destBitmapData = malloc( bytesPerRow * destResolution.height );
-        if (destBitmapData == NULL) {
-            return image;
-        }
-        
         // kCGImageAlphaNone is not supported in CGBitmapContextCreate.
         // Since the original image here has no alpha info, use kCGImageAlphaNoneSkipLast
         // to create bitmap graphics contexts without alpha info.
-        destContext = CGBitmapContextCreate(destBitmapData,
+        destContext = CGBitmapContextCreate(NULL,
                                             destResolution.width,
                                             destResolution.height,
                                             kBitsPerComponent,
@@ -133,7 +127,6 @@ static const CGFloat kDestSeemOverlap = 2.0f;   // the numbers of pixels to over
                                             kCGBitmapByteOrderDefault|kCGImageAlphaNoneSkipLast);
         
         if (destContext == NULL) {
-            free(destBitmapData);
             return image;
         }
         CGContextSetInterpolationQuality(destContext, kCGInterpolationHigh);