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hdlc_ppp: sync per-proto timers before freeing hdlc state

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Each PPP control protocol (LCP/IPCP/IPV6CP) embedded in struct ppp
registers a timer via timer_setup(). That struct ppp is the
hdlc->state allocation, which detach_hdlc_protocol() frees with kfree()
in both teardown paths: unregister_hdlc_device() and the re-attach inside
attach_hdlc_protocol().

The ppp proto never registered a .detach callback, so
detach_hdlc_protocol() performs no timer synchronization before the
kfree(). The only cancel, timer_delete(&proto->timer) in ppp_cp_event(),
is partial (it does not wait for a running callback) and only runs on the
->CLOSED transition; ppp_stop()/ppp_close() do not sync either. A
ppp_timer callback already executing (blocked on ppp->lock) survives the
kfree and then dereferences proto->state / ppp->lock in freed memory,
leading to a use-after-free.

Fix this by adding a .detach helper that calls timer_shutdown_sync() on
every per-proto timer. detach_hdlc_protocol() invokes proto->detach(dev)
before kfree(hdlc->state), so timer_shutdown_sync()
now runs on both free paths.
timer_shutdown_sync() is used instead of timer_delete_sync() because the
keepalive path re-arms the timer through add_timer()/mod_timer() and
shutdown blocks any re-activation during teardown.

Initialize the per-protocol timers in ppp_ioctl() when the protocol is
attached, and remove the now-redundant timer_setup() from ppp_start(), so
that the timers are initialized exactly once at attach time and
ppp_timer_release() never operates on uninitialized timer_list
structures. attach_hdlc_protocol() uses kmalloc() (not kzalloc), so
struct ppp's protos[i].timer is uninitialized garbage until the first
timer_setup(); without this init-at-attach, attaching the PPP protocol
without ever bringing the device up would leave timer_shutdown_sync()
operating on uninitialized memory in .detach. Moving the init out of
ppp_start() (which only runs on NETDEV_UP) into the attach path makes the
initialization unconditional and avoids initializing the same timer_list
twice.

This bug was found by static analysis.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Signed-off-by: Fan Wu <fanwu01@zju.edu.cn>
Link: https://patch.msgid.link/20260617020518.116319-1-fanwu01@zju.edu.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Fan Wu
2026-06-17 02:05:18 +00:00
committed by Jakub Kicinski
parent 27b9daba50
commit c78a4e41ab
1 changed files with 13 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/net/wan/hdlc_ppp.c
View File

@@ -619,7 +619,6 @@ static void ppp_start(struct net_device *dev)
struct proto *proto = &ppp->protos[i];
proto->dev = dev;
timer_setup(&proto->timer, ppp_timer, 0);
proto->state = CLOSED;
}
ppp->protos[IDX_LCP].pid = PID_LCP;
@@ -639,6 +638,15 @@ static void ppp_close(struct net_device *dev)
ppp_tx_flush();
}
static void ppp_timer_release(struct net_device *dev)
{
struct ppp *ppp = get_ppp(dev);
int i;
for (i = 0; i < IDX_COUNT; i++)
timer_shutdown_sync(&ppp->protos[i].timer);
}
static struct hdlc_proto proto = {
.start = ppp_start,
.stop = ppp_stop,
@@ -647,6 +655,7 @@ static struct hdlc_proto proto = {
.ioctl = ppp_ioctl,
.netif_rx = ppp_rx,
.module = THIS_MODULE,
.detach = ppp_timer_release,
};
static const struct header_ops ppp_header_ops = {
@@ -657,7 +666,7 @@ static int ppp_ioctl(struct net_device *dev, struct if_settings *ifs)
{
hdlc_device *hdlc = dev_to_hdlc(dev);
struct ppp *ppp;
int result;
int i, result;
switch (ifs->type) {
case IF_GET_PROTO:
@@ -685,6 +694,8 @@ static int ppp_ioctl(struct net_device *dev, struct if_settings *ifs)
return result;
ppp = get_ppp(dev);
for (i = 0; i < IDX_COUNT; i++)
timer_setup(&ppp->protos[i].timer, ppp_timer, 0);
spin_lock_init(&ppp->lock);
ppp->req_timeout = 2;
ppp->cr_retries = 10;