Check for QImage allocation failure in qgifhandler

Since image files easily can be (or corrupt files claim to be) huge,
it is worth checking for out of memory situations.

Change-Id: I635a3ec6852288079fdec4e14cf7e776fe59e9e0
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

1 files changed, 6 insertions, 1 deletions

diff --git a/src/plugins/imageformats/gif/qgifhandler.cpp b/src/plugins/imageformats/gif/qgifhandler.cpp
index e0f7f44701..ebe5964664 100644
--- a/src/plugins/imageformats/gif/qgifhandler.cpp
+++ b/src/plugins/imageformats/gif/qgifhandler.cpp
@@ -354,7 +354,8 @@ int QGIFFormat::decode(QImage *image, const uchar *buffer, int length,
                     (*image) = QImage(swidth, sheight, format);
                     bpl = image->bytesPerLine();
                     bits = image->bits();
-                    memset(bits, 0, image->sizeInBytes());
+                    if (bits)
+                        memset(bits, 0, image->sizeInBytes());
                 }
 
                 // Check if the previous attempt to create the image failed. If it
@@ -415,6 +416,10 @@ int QGIFFormat::decode(QImage *image, const uchar *buffer, int length,
                         backingstore = QImage(qMax(backingstore.width(), w),
                                               qMax(backingstore.height(), h),
                                               QImage::Format_RGB32);
+                        if (backingstore.isNull()) {
+                            state = Error;
+                            return -1;
+                        }
                         memset(backingstore.bits(), 0, backingstore.sizeInBytes());
                     }
                     const int dest_bpl = backingstore.bytesPerLine();