Re: [PATCH 2/2] rust_binder: avoid reading the written value in offsets array

[kernel test robot <lkp@intel.com>]

Hi Alice,

kernel test robot noticed the following build errors:

[auto build test ERROR on 0f2acd3148e0ef42bdacbd477f90e8533f96b2ac]

url:    https://github.com/intel-lab-lkp/linux/commits/Alice-Ryhl/rust_binder-check-ownership-before-using-vma/20260217-222439
base:   0f2acd3148e0ef42bdacbd477f90e8533f96b2ac
patch link:    https://lore.kernel.org/r/20260217-binder-vma-check-v1-2-1a2b37f7b762%40google.com
patch subject: [PATCH 2/2] rust_binder: avoid reading the written value in offsets array
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20260217/202602172222.mGDpJK77-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
rustc: rustc 1.88.0 (6b00bc388 2025-06-23)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260217/202602172222.mGDpJK77-lkp@intel.com/reproduce)

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>
| Closes: https://lore.kernel.org/oe-kbuild-all/202602172222.mGDpJK77-lkp@intel.com/

All errors (new ones prefixed by >>):

   PATH=/opt/cross/clang-20/bin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
   INFO PATH=/opt/cross/rustc-1.88.0-bindgen-0.72.1/cargo/bin:/opt/cross/clang-20/bin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
   /usr/bin/timeout -k 100 12h /usr/bin/make KCFLAGS=\ -fno-crash-diagnostics\ -Wno-error=return-type\ -Wreturn-type\ -funsigned-char\ -Wundef\ -falign-functions=64 W=1 --keep-going LLVM=1 -j32 -C source O=/kbuild/obj/consumer/x86_64-rhel-9.4-rust ARCH=x86_64 SHELL=/bin/bash rustfmtcheck 
   make: Entering directory '/kbuild/src/consumer'
   make[1]: Entering directory '/kbuild/obj/consumer/x86_64-rhel-9.4-rust'
>> Diff in drivers/android/binder/thread.rs:1018:
            if offsets_size > 0 {
                let mut offsets_reader =
                    UserSlice::new(UserPtr::from_addr(trd_data_ptr.offsets as _), offsets_size)
   -                .reader();
   +                    .reader();
    
                let offsets_start = aligned_data_size;
                let offsets_end = aligned_data_size + offsets_size;
>> Diff in drivers/android/binder/thread.rs:1018:
            if offsets_size > 0 {
                let mut offsets_reader =
                    UserSlice::new(UserPtr::from_addr(trd_data_ptr.offsets as _), offsets_size)
   -                .reader();
   +                    .reader();
    
                let offsets_start = aligned_data_size;
                let offsets_end = aligned_data_size + offsets_size;
   make[2]: *** [Makefile:1903: rustfmt] Error 123
   make[2]: Target 'rustfmtcheck' not remade because of errors.
   make[1]: Leaving directory '/kbuild/obj/consumer/x86_64-rhel-9.4-rust'
   make[1]: *** [Makefile:248: __sub-make] Error 2
   make[1]: Target 'rustfmtcheck' not remade because of errors.
   make: *** [Makefile:248: __sub-make] Error 2
   make: Target 'rustfmtcheck' not remade because of errors.
   make: Leaving directory '/kbuild/src/consumer'

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