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| author |   Dmitry Antipov <dmantipov@yandex.ru> | 2025-05-07 09:50:44 +0300 |
|---|---|---|
| committer |   Petr Pavlu <petr.pavlu@suse.com> | 2025-05-07 20:24:59 +0200 |
| commit | a6aeb739974ec73e5217c75a7c008a688d3d5cf1 (patch) | |
| tree | ad2bdcde134048fd34adc0568802721730fe2b58 /scripts/lib/kdoc/kdoc_files.py | |
| parent | Linux 6.15-rc5 (diff) | |
| download | linux-rng-a6aeb739974ec73e5217c75a7c008a688d3d5cf1.tar.xz linux-rng-a6aeb739974ec73e5217c75a7c008a688d3d5cf1.zip | |
module: ensure that kobject_put() is safe for module type kobjects
In 'lookup_or_create_module_kobject()', an internal kobject is created
using 'module_ktype'. So call to 'kobject_put()' on error handling
path causes an attempt to use an uninitialized completion pointer in
'module_kobject_release()'. In this scenario, we just want to release
kobject without an extra synchronization required for a regular module
unloading process, so adding an extra check whether 'complete()' is
actually required makes 'kobject_put()' safe.
Reported-by: syzbot+7fb8a372e1f6add936dd@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=7fb8a372e1f6add936dd
Fixes: 942e443127e9 ("module: Fix mod->mkobj.kobj potentially freed too early")
Cc: stable@vger.kernel.org
Suggested-by: Petr Pavlu <petr.pavlu@suse.com>
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Link: https://lore.kernel.org/r/20250507065044.86529-1-dmantipov@yandex.ru
Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>
Diffstat (limited to 'scripts/lib/kdoc/kdoc_files.py')
0 files changed, 0 insertions, 0 deletions