From: Guenter Roeck linux@roeck-us.net
[ Upstream commit 7635a1ad8d92dcc8247b53f949e37795154b5b6f ]
In Chrome OS, a large number of crashes is observed due to corrupted timer lists. Steven Rostedt pointed out that this usually happens when a timer is freed while still active, and that the problem is often triggered by code calling del_timer() instead of del_timer_sync() just before freeing.
Steven also identified the iwlwifi driver as one of the possible culprits since it does exactly that.
Reported-by: Steven Rostedt rostedt@goodmis.org Cc: Steven Rostedt rostedt@goodmis.org Cc: Johannes Berg johannes.berg@intel.com Cc: Gregory Greenman gregory.greenman@intel.com Fixes: 60e8abd9d3e91 ("iwlwifi: dbg_ini: add periodic trigger new API support") Signed-off-by: Guenter Roeck linux@roeck-us.net Acked-by: Gregory Greenman gregory.greenman@intel.com Tested-by: Sedat Dilek sedat.dilek@gmail.com # Linux v5.17.3-rc1 and Debian LLVM-14 Signed-off-by: Kalle Valo kvalo@kernel.org Link: https://lore.kernel.org/r/20220411154210.1870008-1-linux@roeck-us.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c index 42f6f8bb83be..901600ca6f0e 100644 --- a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c +++ b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c @@ -362,7 +362,7 @@ void iwl_dbg_tlv_del_timers(struct iwl_trans *trans) struct iwl_dbg_tlv_timer_node *node, *tmp;
list_for_each_entry_safe(node, tmp, timer_list, list) { - del_timer(&node->timer); + del_timer_sync(&node->timer); list_del(&node->list); kfree(node); }