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authorMin Li <lm0963hack@gmail.com>2023-03-04 17:23:30 +0300
committerLuiz Augusto von Dentz <luiz.von.dentz@intel.com>2023-04-10 20:22:46 +0300
commitc95930abd687fcd1aa040dc4fe90dff947916460 (patch)
treeee7c2ab5647d59aacab0db64e4f407a9446acc65 /net/bluetooth
parentb62e72200eaad523f08d8319bba50fc652e032a8 (diff)
downloadlinux-c95930abd687fcd1aa040dc4fe90dff947916460.tar.xz
Bluetooth: Fix race condition in hidp_session_thread
There is a potential race condition in hidp_session_thread that may lead to use-after-free. For instance, the timer is active while hidp_del_timer is called in hidp_session_thread(). After hidp_session_put, then 'session' will be freed, causing kernel panic when hidp_idle_timeout is running. The solution is to use del_timer_sync instead of del_timer. Here is the call trace: ? hidp_session_probe+0x780/0x780 call_timer_fn+0x2d/0x1e0 __run_timers.part.0+0x569/0x940 hidp_session_probe+0x780/0x780 call_timer_fn+0x1e0/0x1e0 ktime_get+0x5c/0xf0 lapic_next_deadline+0x2c/0x40 clockevents_program_event+0x205/0x320 run_timer_softirq+0xa9/0x1b0 __do_softirq+0x1b9/0x641 __irq_exit_rcu+0xdc/0x190 irq_exit_rcu+0xe/0x20 sysvec_apic_timer_interrupt+0xa1/0xc0 Cc: stable@vger.kernel.org Signed-off-by: Min Li <lm0963hack@gmail.com> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Diffstat (limited to 'net/bluetooth')
-rw-r--r--net/bluetooth/hidp/core.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index bed1a7b9205c..707f229f896a 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -433,7 +433,7 @@ static void hidp_set_timer(struct hidp_session *session)
static void hidp_del_timer(struct hidp_session *session)
{
if (session->idle_to > 0)
- del_timer(&session->timer);
+ del_timer_sync(&session->timer);
}
static void hidp_process_report(struct hidp_session *session, int type,