Re: [PATCH] efistub/smbios: Add fallback for SMBIOS record lookup

[Philip Li <philip.li@intel.com>]

On Thu, Nov 06, 2025 at 06:50:12PM +0100, Ard Biesheuvel wrote:
> Hi Dan,
> 
> On Thu, 6 Nov 2025 at 14:08, Dan Carpenter <dan.carpenter@linaro.org> wrote:
> >
> > Hi Francesco,
> >
> > kernel test robot noticed the following build warnings:
> >
> > https://git-scm.com/docs/git-format-patch#_base_tree_information]
> >
> > url:    https://github.com/intel-lab-lkp/linux/commits/Francesco-Pompo/efistub-smbios-Add-fallback-for-SMBIOS-record-lookup/20251102-081803
> > base:   https://git.kernel.org/pub/scm/linux/kernel/git/efi/efi.git next
> > patch link:    https://lore.kernel.org/r/20251102001411.108385-1-francescopompo2%40gmail.com
> > patch subject: [PATCH] efistub/smbios: Add fallback for SMBIOS record lookup
> > config: i386-randconfig-141-20251103 (https://download.01.org/0day-ci/archive/20251104/202511040131.8yGeRa6u-lkp@intel.com/config)
> > compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
> >
> > If you fix the issue in a separate patch/commit (i.e. not just a new version of
> > the same patch/commit), kindly add following tags
> > | Reported-by: kernel test robot <lkp@intel.com>
> > | Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
> > | Closes: https://lore.kernel.org/r/202511040131.8yGeRa6u-lkp@intel.com/
> >
> > smatch warnings:
> > drivers/firmware/efi/libstub/smbios.c:55 verify_ep_int_checksum() error: buffer overflow 'ptr' 5 <= 14
> >
> > vim +/ptr +55 drivers/firmware/efi/libstub/smbios.c
> >
> > d45578057224c4 Francesco Pompo 2025-11-02  48  static bool verify_ep_int_checksum(const struct smbios_entry_point *ep)
> > d45578057224c4 Francesco Pompo 2025-11-02  49  {
> > d45578057224c4 Francesco Pompo 2025-11-02  50   const u8 *ptr = (u8 *)&ep->int_anchor;
> > d45578057224c4 Francesco Pompo 2025-11-02  51   u8 sum = 0;
> > d45578057224c4 Francesco Pompo 2025-11-02  52   int i;
> > d45578057224c4 Francesco Pompo 2025-11-02  53
> > d45578057224c4 Francesco Pompo 2025-11-02  54   for (i = 0; i < 15; i++)
> > d45578057224c4 Francesco Pompo 2025-11-02 @55           sum += ptr[i];
> >
> > This loop reads across a bunch of struct members.  We would normally
> > use a struct_group() to say that all the struct members are grouped
> > together.
> >
> > d45578057224c4 Francesco Pompo 2025-11-02  56
> > d45578057224c4 Francesco Pompo 2025-11-02  57   return sum == 0;
> > d45578057224c4 Francesco Pompo 2025-11-02  58  }
> >
> 
> Please report issues against the version of the patch that is actually
> in -next, rather than random versions from the mailing list.

Sorry for this, this is the bot issue, that i will update bot to try to filter
out such patches from mailing list to avoid testing them.

>