Re: [Patch MdeModulePkg/Library v1 1/1] MdeModulePkg/UefiBootManangerLib: Fix exception issue

["Wu, Hao A" <hao.a.wu@intel.com>]

Thanks Ming and Leif.

Reviewed-by: Hao Wu <hao.a.wu@intel.com>
Patch was committed at 6c27a4d337d0034cecf9f2c05d1f20c342d41e01.

Best Regards,
Hao Wu


> -----Original Message-----
> From: Leif Lindholm [mailto:leif.lindholm@linaro.org]
> Sent: Tuesday, March 19, 2019 9:47 PM
> To: Ming Huang
> Cc: linaro-uefi@lists.linaro.org; edk2-devel@lists.01.org; Wu, Hao A; Kinney,
> Michael D; Gao, Liming; ard.biesheuvel@linaro.org;
> wanghuiqiang@huawei.com; huangming23@huawei.com;
> zhangjinsong2@huawei.com; mengfanrong@huawei.com;
> huangdaode@hisilicon.com
> Subject: Re: [Patch MdeModulePkg/Library v1 1/1]
> MdeModulePkg/UefiBootManangerLib: Fix exception issue
> 
> Thanks, Ming.
> 
> On Tue, Mar 19, 2019 at 08:59:13PM +0800, Ming Huang wrote:
> > The system environment: virtual-CDROM(USB interface) via BMC, insert a
> > iso file to CDROM, like ubuntu-18.04.1-server-arm64.iso, change CDROM
> > to first boot option.
> > With release version bios, disconnecting CDROM when boot to
> > "1 seconds left, Press Esc or F2 to enter Setup"
> > then system will get a exception.
> >
> > The root cause is the EFI_BLOCK_IO_PROTOCOL for UsbMass will be
> uninstalled
> > in this situation after print some transfer error. The status will be
> > invalid parameter. This line will get a exception for BlockIo not point
> > to right address:
> > AllocatePool (BlockIo->Media->BlockSize)
> > So, here need to judge the status after ASSERT_EFI_ERROR.
> >
> > The Bugzilla tracker for this:
> > https://bugzilla.tianocore.org/show_bug.cgi?id=1631
> >
> > Contributed-under: TianoCore Contribution Agreement 1.1
> > Signed-off-by: Ming Huang <ming.huang@linaro.org>
> 
> Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
> 
> > ---
> >  MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c
> b/MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c
> > index 4ce83ce22d61..0535cd7335b4 100644
> > --- a/MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c
> > +++ b/MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c
> > @@ -1069,6 +1069,9 @@ BmExpandMediaDevicePath (
> >    //
> >    Status = gBS->HandleProtocol (Handle, &gEfiBlockIoProtocolGuid, (VOID
> **) &BlockIo);
> >    ASSERT_EFI_ERROR (Status);
> > +  if (EFI_ERROR (Status)) {
> > +    return NULL;
> > +  }
> >    Buffer = AllocatePool (BlockIo->Media->BlockSize);
> >    if (Buffer != NULL) {
> >      BlockIo->ReadBlocks (
> > --
> > 2.9.5
> >