Libsane-hpaio returns invalid data and makes sane frontend crash

[Sergio Callegari]

In some cases libsane-hpaio returns invalid data as the scanned image and makes sane frontend (xsane) crash.

I have seen it with an HP 6950 all-in-one inkjet and now I am seeing it again with HP Color Laserjet Pro M281.

Returning of invalid data is reproducible by selecting 'lineart' scanning mode + 'None' as the compression.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: libsane-hpaio 3.19.1+dfsg0-1
ProcVersionSignature: Ubuntu 5.0.0-16.17-generic 5.0.8
Uname: Linux 5.0.0-16-generic x86_64
ApportVersion: 2.20.10-0ubuntu27
Architecture: amd64
CupsErrorLog:
 W [18/Jun/2019:08:36:15 +0200] CreateProfile failed: org.freedesktop.ColorManager.AlreadyExists:profile id \'HP_Color_LaserJet_MFP_M281fdw_DACB6D_-Gray..\' already exists
 W [18/Jun/2019:08:36:15 +0200] CreateProfile failed: org.freedesktop.ColorManager.AlreadyExists:profile id \'HP_Color_LaserJet_MFP_M281fdw_DACB6D_-DeviceN..\' already exists
 W [18/Jun/2019:13:16:45 +0200] CreateProfile failed: org.freedesktop.ColorManager.AlreadyExists:profile id \'HP_Color_LaserJet_MFP_M281fdw_DACB6D_-Gray..\' already exists
 W [18/Jun/2019:13:16:45 +0200] CreateProfile failed: org.freedesktop.ColorManager.AlreadyExists:profile id \'HP_Color_LaserJet_MFP_M281fdw_DACB6D_-DeviceN..\' already exists
 E [18/Jun/2019:13:30:22 +0200] [Client 17] Returning IPP client-error-bad-request for Create-Printer-Subscriptions (/) from localhost.
CurrentDesktop: KDE
Date: Tue Jun 18 15:29:51 2019
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-12-12 (2013 days ago)
InstallationMedia: Kubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MachineType: Notebook W740SU
Papersize: a4
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.0.0-16-generic root=/dev/mapper/zagar_ssd--vg-root ro quiet splash resume=/dev/zagar_ssd-vg/swap_1 acpi_backlight=vendor vt.handoff=1
SourcePackage: hplip
UpgradeStatus: Upgraded to disco on 2019-06-12 (5 days ago)
dmi.bios.date: 10/02/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 4.6.5
dmi.board.asset.tag: Tag 12345
dmi.board.name: W740SU
dmi.board.vendor: Notebook
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: Notebook
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd10/02/2013:svnNotebook:pnW740SU:pvrNotApplicable:rvnNotebook:rnW740SU:rvrNotApplicable:cvnNotebook:ct9:cvrN/A:
dmi.product.family: Not Applicable
dmi.product.name: W740SU
dmi.product.sku: Not Applicable
dmi.product.version: Not Applicable
dmi.sys.vendor: Notebook