title: io_uring: fix link timeout refs
description: In the Linux kernel, the following vulnerability has been resolved:
io_uring: fix link timeout refs
WARNING: CPU: 0 PID: 10242 at lib/refcount.c:28 refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28
RIP: 0010:refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28
Call Trace:
__refcount_sub_and_test include/linux/refcount.h:283 [inline]
__refcount_dec_and_test include/linux/refcount.h:315 [inline]
refcount_dec_and_test include/linux/refcount.h:333 [inline]
io_put_req fs/io_uring.c:2140 [inline]
io_queue_linked_timeout fs/io_uring.c:6300 [inline]
__io_queue_sqe+0xbef/0xec0 fs/io_uring.c:6354
io_submit_sqe fs/io_uring.c:6534 [inline]
io_submit_sqes+0x2bbd/0x7c50 fs/io_uring.c:6660
__do_sys_io_uring_enter fs/io_uring.c:9240 [inline]
__se_sys_io_uring_enter+0x256/0x1d60 fs/io_uring.c:9182
io_link_timeout_fn() should put only one reference of the linked timeout
request, however in case of racing with the master request's completion
first io_req_complete() puts one and then io_put_req_deferred() is
called.
affected:
{
product: Linux
vendor: Linux
defaultStatus: unaffected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions:
version: 1c20e9040f49, lessThan: 0b2a990e5d2f, status: affected, versionType: git
version: 1c20e9040f49, lessThan: 6f5d7a45f58d, status: affected, versionType: git
version: 9ae1f8dd372e, lessThan: 876808dba2ff, status: affected, versionType: git
version: 9ae1f8dd372e, lessThan: ff4a96ba5c8f, status: affected, versionType: git
version: 9ae1f8dd372e, lessThan: a298232ee6b9, status: affected, versionType: git
}
{
product: Linux
vendor: Linux
defaultStatus: affected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions:
version: 5.12, status: affected
version: 0, lessThan: 5.12, status: unaffected, versionType: custom
version: 5.10.43, lessThanOrEqual: 5.10.*, status: unaffected, versionType: custom
version: 5.10.55, lessThanOrEqual: 5.10.*, status: unaffected, versionType: custom
version: 5.12.10, lessThanOrEqual: 5.12.*, status: unaffected, versionType: custom
version: 5.12.19, lessThanOrEqual: 5.12.*, status: unaffected, versionType: custom
version: 5.13, lessThanOrEqual: *, status: unaffected, versionType: original_commit_for_fix
}
