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charset=us-ascii Content-Disposition: inline BCC: lkp@intel.com CC: oe-kbuild-all@lists.linux.dev CC: linux-kernel@vger.kernel.org TO: Andrey Konovalov CC: Andrew Morton CC: Linux Memory Management List CC: Alexander Potapenko tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: f92f4749861b06fed908d336b4dee1326003291b commit: 7d88e4f768b0fdb85b68f0e4679bb10fdb05c808 kasan: check object_size in kasan_complete_mode_report_info date: 1 year ago :::::: branch date: 22 hours ago :::::: commit date: 1 year ago config: arm64-randconfig-r072-20241210 (https://download.01.org/0day-ci/archive/20241212/202412120809.Tiq6Vag9-lkp@intel.com/config) compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff) 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 | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202412120809.Tiq6Vag9-lkp@intel.com/ smatch warnings: mm/kasan/report_tags.c:63 kasan_complete_mode_report_info() error: we previously assumed 'info->cache' could be null (see line 37) vim +63 mm/kasan/report_tags.c b89933e9a54d3e7 Andrey Konovalov 2022-09-05 29 59e6e098d1c156f Andrey Konovalov 2022-09-05 30 void kasan_complete_mode_report_info(struct kasan_report_info *info) b89933e9a54d3e7 Andrey Konovalov 2022-09-05 31 { 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 32 unsigned long flags; 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 33 u64 pos; 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 34 struct kasan_stack_ring_entry *entry; 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 35 bool alloc_found = false, free_found = false; 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 36 dcc579663f60739 Andrey Konovalov 2022-09-11 @37 if ((!info->cache || !info->object) && !info->bug_type) { 1f538e1f2d294cf Andrey Konovalov 2022-09-05 38 info->bug_type = get_common_bug_type(info); 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 39 return; 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 40 } 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 41 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 42 write_lock_irqsave(&stack_ring.lock, flags); 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 43 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 44 pos = atomic64_read(&stack_ring.pos); 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 45 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 46 /* 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 47 * The loop below tries to find stack ring entries relevant to the 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 48 * buggy object. This is a best-effort process. 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 49 * 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 50 * First, another object with the same tag can be allocated in place of 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 51 * the buggy object. Also, since the number of entries is limited, the 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 52 * entries relevant to the buggy object can be overwritten. 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 53 */ 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 54 80b92bfe3bb75aa Andrey Konovalov 2022-09-05 55 for (u64 i = pos - 1; i != pos - 1 - stack_ring.size; i--) { 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 56 if (alloc_found && free_found) 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 57 break; 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 58 80b92bfe3bb75aa Andrey Konovalov 2022-09-05 59 entry = &stack_ring.entries[i % stack_ring.size]; 7bc0584e5d2a687 Andrey Konovalov 2022-09-05 60 f3b597986299408 Andrey Konovalov 2023-11-20 61 if (kasan_reset_tag(entry->ptr) != info->object || 7d88e4f768b0fdb Andrey Konovalov 2023-11-20 62 get_tag(entry->ptr) != get_tag(info->access_addr) || 7d88e4f768b0fdb Andrey Konovalov 2023-11-20 @63 info->cache->object_size != entry->size) -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki