From: kernel test robot <lkp@intel.com>
To: aubrey.li@linux.intel.com
Cc: oe-kbuild-all@lists.linux.dev
Subject: [anolis-intel-cloud:devel-5.10 9/9] ./include/linux/list.h:70:20: warning: storing the address of local variable 'waiter' in '((struct list_head *)((char *)sem + 8))[4].prev'
Date: Wed, 28 Oct 2026 09:54:22 +0100 [thread overview]
Message-ID: <202610280911.KkXmc2NG-lkp@intel.com> (raw)
tree: https://gitee.com/anolis/intel-cloud-kernel.git devel-5.10
head: e404899677bc470e620572471a562f09ea3de082
commit: 50f3b00d4c7ba9aef6e0be4db192ee81f4f8a125 [9/9] libsubcmd: Fix use-after-free for realloc(..., 0)
config: x86_64-allnoconfig-bpf (https://download.01.org/0day-ci/archive/20261028/202610280911.KkXmc2NG-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261028/202610280911.KkXmc2NG-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/202610280911.KkXmc2NG-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from ./include/linux/rculist.h:10,
from ./include/linux/pid.h:5,
from ./include/linux/sched.h:14,
from kernel/locking/semaphore.c:30:
In function '__list_add',
inlined from 'list_add_tail' at ./include/linux/list.h:100:2,
inlined from '__down_common' at kernel/locking/semaphore.c:209:2,
inlined from '__down_timeout' at kernel/locking/semaphore.c:252:9:
>> ./include/linux/list.h:70:20: warning: storing the address of local variable 'waiter' in '((struct list_head *)((char *)sem + 8))[4].prev' [-Wdangling-pointer=]
70 | next->prev = new;
| ~~~~~~~~~~~^~~~~
kernel/locking/semaphore.c: In function '__down_timeout':
kernel/locking/semaphore.c:207:33: note: 'waiter' declared here
207 | struct semaphore_waiter waiter;
| ^~~~~~
kernel/locking/semaphore.c:250:62: note: 'sem' declared here
250 | static noinline int __sched __down_timeout(struct semaphore *sem, long timeout)
| ~~~~~~~~~~~~~~~~~~^~~
In function '__list_add',
inlined from 'list_add_tail' at ./include/linux/list.h:100:2,
inlined from '__down_common' at kernel/locking/semaphore.c:209:2,
inlined from '__down' at kernel/locking/semaphore.c:237:2:
>> ./include/linux/list.h:70:20: warning: storing the address of local variable 'waiter' in '((struct list_head *)((char *)sem + 8))[4].prev' [-Wdangling-pointer=]
70 | next->prev = new;
| ~~~~~~~~~~~^~~~~
kernel/locking/semaphore.c: In function '__down':
kernel/locking/semaphore.c:207:33: note: 'waiter' declared here
207 | struct semaphore_waiter waiter;
| ^~~~~~
kernel/locking/semaphore.c:235:55: note: 'sem' declared here
235 | static noinline void __sched __down(struct semaphore *sem)
| ~~~~~~~~~~~~~~~~~~^~~
vim +70 ./include/linux/list.h
d7c816733d501b5 Kees Cook 2016-08-17 56
^1da177e4c3f415 Linus Torvalds 2005-04-16 57 /*
^1da177e4c3f415 Linus Torvalds 2005-04-16 58 * Insert a new entry between two known consecutive entries.
^1da177e4c3f415 Linus Torvalds 2005-04-16 59 *
^1da177e4c3f415 Linus Torvalds 2005-04-16 60 * This is only for internal list manipulation where we know
^1da177e4c3f415 Linus Torvalds 2005-04-16 61 * the prev/next entries already!
^1da177e4c3f415 Linus Torvalds 2005-04-16 62 */
^1da177e4c3f415 Linus Torvalds 2005-04-16 63 static inline void __list_add(struct list_head *new,
^1da177e4c3f415 Linus Torvalds 2005-04-16 64 struct list_head *prev,
^1da177e4c3f415 Linus Torvalds 2005-04-16 65 struct list_head *next)
^1da177e4c3f415 Linus Torvalds 2005-04-16 66 {
d7c816733d501b5 Kees Cook 2016-08-17 67 if (!__list_add_valid(new, prev, next))
d7c816733d501b5 Kees Cook 2016-08-17 68 return;
d7c816733d501b5 Kees Cook 2016-08-17 69
^1da177e4c3f415 Linus Torvalds 2005-04-16 @70 next->prev = new;
^1da177e4c3f415 Linus Torvalds 2005-04-16 71 new->next = next;
^1da177e4c3f415 Linus Torvalds 2005-04-16 72 new->prev = prev;
1c97be677f72b3c Paul E. McKenney 2015-09-20 73 WRITE_ONCE(prev->next, new);
^1da177e4c3f415 Linus Torvalds 2005-04-16 74 }
^1da177e4c3f415 Linus Torvalds 2005-04-16 75
^1da177e4c3f415 Linus Torvalds 2005-04-16 76 /**
^1da177e4c3f415 Linus Torvalds 2005-04-16 77 * list_add - add a new entry
^1da177e4c3f415 Linus Torvalds 2005-04-16 78 * @new: new entry to be added
^1da177e4c3f415 Linus Torvalds 2005-04-16 79 * @head: list head to add it after
^1da177e4c3f415 Linus Torvalds 2005-04-16 80 *
^1da177e4c3f415 Linus Torvalds 2005-04-16 81 * Insert a new entry after the specified head.
^1da177e4c3f415 Linus Torvalds 2005-04-16 82 * This is good for implementing stacks.
^1da177e4c3f415 Linus Torvalds 2005-04-16 83 */
^1da177e4c3f415 Linus Torvalds 2005-04-16 84 static inline void list_add(struct list_head *new, struct list_head *head)
^1da177e4c3f415 Linus Torvalds 2005-04-16 85 {
^1da177e4c3f415 Linus Torvalds 2005-04-16 86 __list_add(new, head, head->next);
^1da177e4c3f415 Linus Torvalds 2005-04-16 87 }
199a9afc3dbe98c Dave Jones 2006-09-29 88
^1da177e4c3f415 Linus Torvalds 2005-04-16 89
^1da177e4c3f415 Linus Torvalds 2005-04-16 90 /**
^1da177e4c3f415 Linus Torvalds 2005-04-16 91 * list_add_tail - add a new entry
^1da177e4c3f415 Linus Torvalds 2005-04-16 92 * @new: new entry to be added
^1da177e4c3f415 Linus Torvalds 2005-04-16 93 * @head: list head to add it before
^1da177e4c3f415 Linus Torvalds 2005-04-16 94 *
^1da177e4c3f415 Linus Torvalds 2005-04-16 95 * Insert a new entry before the specified head.
^1da177e4c3f415 Linus Torvalds 2005-04-16 96 * This is useful for implementing queues.
^1da177e4c3f415 Linus Torvalds 2005-04-16 97 */
^1da177e4c3f415 Linus Torvalds 2005-04-16 98 static inline void list_add_tail(struct list_head *new, struct list_head *head)
^1da177e4c3f415 Linus Torvalds 2005-04-16 99 {
^1da177e4c3f415 Linus Torvalds 2005-04-16 @100 __list_add(new, head->prev, head);
^1da177e4c3f415 Linus Torvalds 2005-04-16 101 }
^1da177e4c3f415 Linus Torvalds 2005-04-16 102
:::::: The code at line 70 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2
:::::: TO: Linus Torvalds <torvalds@ppc970.osdl.org>
:::::: CC: Linus Torvalds <torvalds@ppc970.osdl.org>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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