From: Alexander Stein <alexander.stein@ew.tq-group.com> stable inclusion from stable-v6.6.34 commit a80d1da923f671c1e6a14e8417cd2f117b27a442 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IA8ADV CVE: CVE-2024-39464 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- commit 6d8acd02c4c6a8f917eefac1de2e035521ca119d upstream. struct v4l2_async_notifier has several list_head members, but only waiting_list and done_list are initialized. notifier_entry was kept 'zeroed' leading to an uninitialized list_head. This results in a NULL-pointer dereference if csi2_async_register() fails, e.g. node for remote endpoint is disabled, and returns -ENOTCONN. The following calls to v4l2_async_nf_unregister() results in a NULL pointer dereference. Add the missing list head initializer. Fixes: b8ec754ae4c5 ("media: v4l: async: Set v4l2_device and subdev in async notifier init") Cc: <stable@vger.kernel.org> # for 6.6 and later Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Kaixiong Yu <yukaixiong@huawei.com> --- drivers/media/v4l2-core/v4l2-async.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c index 8cfd593d293d..8402f369c7e3 100644 --- a/drivers/media/v4l2-core/v4l2-async.c +++ b/drivers/media/v4l2-core/v4l2-async.c @@ -563,6 +563,7 @@ void v4l2_async_nf_init(struct v4l2_async_notifier *notifier, { INIT_LIST_HEAD(¬ifier->waiting_list); INIT_LIST_HEAD(¬ifier->done_list); + INIT_LIST_HEAD(¬ifier->notifier_entry); notifier->v4l2_dev = v4l2_dev; } EXPORT_SYMBOL(v4l2_async_nf_init); @@ -572,6 +573,7 @@ void v4l2_async_subdev_nf_init(struct v4l2_async_notifier *notifier, { INIT_LIST_HEAD(¬ifier->waiting_list); INIT_LIST_HEAD(¬ifier->done_list); + INIT_LIST_HEAD(¬ifier->notifier_entry); notifier->sd = sd; } EXPORT_SYMBOL_GPL(v4l2_async_subdev_nf_init); -- 2.25.1