orient function uses exif_read_data for which valid image types are only JPEG and TIFF as per the document [1].
When trying to upload an screenshot with png type I was getting message as *failed* even though image was uploading. So added a fix to check image type before calling orient function. Not sure if this is a proper fix but after this i'm not getting any error during file upload [1] http://au2.php.net/manual/en/function.exif-read-data.php
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@ -740,7 +740,8 @@ function photos_post(&$a) {
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killme();
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}
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$ph->orient($src);
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if($ph->getType() != 'image/png')
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$ph->orient($src);
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@unlink($src);
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$max_length = get_config('system','max_image_length');
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