Re: Bug#849696: libogre-1.9.0v5: Ogre games abort on startup with “basic_string::_M_construct null not valid” / freeimage API issues

[James Cowgill]

Control: severity -1 grave

Hi,

This is RC because nothing using ogre will start anymore.

On 29/12/16 21:52, Thibaut Girka wrote:
> Package: libogre-1.9.0v5
> Version: 1.9.0+dfsg1-7+b2
> Severity: important
> 
> Any Ogre game/application (for instance, funguloids, available in Debian)
> crashes with the following output:
> 
>   Creating resource group General
>   Creating resource group Internal
>   Creating resource group Autodetect
>   SceneManagerFactory for type 'DefaultSceneManager' registered.
>   Registering ResourceManager for type Material
>   Registering ResourceManager for type Mesh
>   Registering ResourceManager for type Skeleton
>   MovableObjectFactory for type 'ParticleSystem' registered.
>   ArchiveFactory for archive type FileSystem registered.
>   ArchiveFactory for archive type Zip registered.
>   ArchiveFactory for archive type EmbeddedZip registered.
>   DDS codec registering
>   FreeImage version: 3.17.0
>   This program uses FreeImage, a free, open source image library supporting all common bitmap formats. See http://freeimage.sourceforge.net for details
>   terminate called after throwing an instance of 'std::logic_error'
>     what():  basic_string::_M_construct null not valid
>   Abandon
> 
> This started happening since upgrading libfreeimage3, so this might be a bug in
> it rather than in Ogre itself, but I haven't investigated any further yet.

This appears to be a regression in the Debian patch applied in
libfreeimage3 3.17.0+ds1-4.

Ogre contains this (OgreMain/src/OgreFreeImageCodec.cpp:98):
> for (int i = 0; i < FreeImage_GetFIFCount(); ++i)
> {
> 	// Skip DDS codec since FreeImage does not have the option 
> 	// to keep DXT data compressed, we'll use our own codec
> 	if ((FREE_IMAGE_FORMAT)i == FIF_DDS)
> 		continue;
> 			
> 	String exts(FreeImage_GetFIFExtensionList((FREE_IMAGE_FORMAT)i));
[loop body continues]
[String is typedefed to std::string]

This code assumes that FreeImage_GetFIFExtensionList will never return
NULL for values of i between 0 and FreeImage_GetFIFCount(). However in
the most recent Debian version of freeimage,
FreeImage_GetFIFExtensionList(27 / FIF_FAXG3) does return NULL.

It is unclear to me who is wrong here. The documentation does not
suggest anything about when FreeImage_GetFIFExtensionList can fail,
although the examples always check FreeImage_FIFSupportsReading before
calling it. Can any freeimage maintainer suggest the best way to fix this?

Thanks,
James

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