From: Ming-Hung Tsai <mtsai@redhat.com> stable inclusion from stable-v6.6.61 commit 8cc12dab635333c4ea28e72d7b947be7d0543c2c category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IB5AVP CVE: CVE-2024-50280 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- commit 135496c208ba26fd68cdef10b64ed7a91ac9a7ff upstream. An unexpected WARN_ON from flush_work() may occur when cache creation fails, caused by destroying the uninitialized delayed_work waker in the error path of cache_create(). For example, the warning appears on the superblock checksum error. Reproduce steps: dmsetup create cmeta --table "0 8192 linear /dev/sdc 0" dmsetup create cdata --table "0 65536 linear /dev/sdc 8192" dmsetup create corig --table "0 524288 linear /dev/sdc 262144" dd if=/dev/urandom of=/dev/mapper/cmeta bs=4k count=1 oflag=direct dmsetup create cache --table "0 524288 cache /dev/mapper/cmeta \ /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0" Kernel logs: (snip) WARNING: CPU: 0 PID: 84 at kernel/workqueue.c:4178 __flush_work+0x5d4/0x890 Fix by pulling out the cancel_delayed_work_sync() from the constructor's error path. This patch doesn't affect the use-after-free fix for concurrent dm_resume and dm_destroy (commit 6a459d8edbdb ("dm cache: Fix UAF in destroy()")) as cache_dtr is not changed. Signed-off-by: Ming-Hung Tsai <mtsai@redhat.com> Fixes: 6a459d8edbdb ("dm cache: Fix UAF in destroy()") Cc: stable@vger.kernel.org Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Acked-by: Joe Thornber <thornber@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Conflicts: drivers/md/dm-cache-target.c [Because HULK-5.10 don't merge mainline patch 86a3238c7b9b759cb864f4f768ab2e24687dc0e6("dm: change "unsigned" to "unsigned int" ")] Signed-off-by: Kaixiong Yu <yukaixiong@huawei.com> --- drivers/md/dm-cache-target.c | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-) diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c index e94409aa2f40..d3821837641b 100644 --- a/drivers/md/dm-cache-target.c +++ b/drivers/md/dm-cache-target.c @@ -1960,16 +1960,13 @@ static void check_migrations(struct work_struct *ws) * This function gets called on the error paths of the constructor, so we * have to cope with a partially initialised struct. */ -static void destroy(struct cache *cache) +static void __destroy(struct cache *cache) { - unsigned i; - mempool_exit(&cache->migration_pool); if (cache->prison) dm_bio_prison_destroy_v2(cache->prison); - cancel_delayed_work_sync(&cache->waker); if (cache->wq) destroy_workqueue(cache->wq); @@ -1997,13 +1994,22 @@ static void destroy(struct cache *cache) if (cache->policy) dm_cache_policy_destroy(cache->policy); + bioset_exit(&cache->bs); + + kfree(cache); +} + +static void destroy(struct cache *cache) +{ + unsigned int i; + + cancel_delayed_work_sync(&cache->waker); + for (i = 0; i < cache->nr_ctr_args ; i++) kfree(cache->ctr_args[i]); kfree(cache->ctr_args); - bioset_exit(&cache->bs); - - kfree(cache); + __destroy(cache); } static void cache_dtr(struct dm_target *ti) @@ -2616,7 +2622,7 @@ static int cache_create(struct cache_args *ca, struct cache **result) *result = cache; return 0; bad: - destroy(cache); + __destroy(cache); return r; } @@ -2667,7 +2673,7 @@ static int cache_ctr(struct dm_target *ti, unsigned argc, char **argv) r = copy_ctr_args(cache, argc - 3, (const char **)argv + 3); if (r) { - destroy(cache); + __destroy(cache); goto out; } -- 2.34.1