From 54faf023be0e8f9bcfdb64fd0afb3a00138cd45f Mon Sep 17 00:00:00 2001 From: Pau Espin Pedrol Date: Thu, 14 Jan 2021 12:12:43 +0100 Subject: [PATCH] Workaround ASan false positive runtime errors under some platforms Under some platforms (RPI4, ARM) container older ASan, it will log false positive log errors which will make unit test fail because then output changes: """ pcu_l1_if.cpp:847:2: runtime error: member access within misaligned address 0xb3f0b78c for type 'struct GprsMs', which requires 8 byte alignment """ The pointer is indeed misaligned, but it's not actually a bug, because the pointer is never derreferenced. That happens during llist_for_each_entry operation where it does cast the pointer but it only checks if the list has actually reached the end. To workaround the issue, simply defer casting it by using llist_for_each instead, where the pointer is assigned only in the case it really points to a GprsMS struct. Change-Id: I149fb42706501eb33f9c6fe48f76a03ddee5954a --- src/pcu_l1_if.cpp | 5 +++-- src/pcu_vty_functions.cpp | 6 ++++-- 2 files changed, 7 insertions(+), 4 deletions(-) diff --git a/src/pcu_l1_if.cpp b/src/pcu_l1_if.cpp index 9cc62708..2aea00b4 100644 --- a/src/pcu_l1_if.cpp +++ b/src/pcu_l1_if.cpp @@ -840,15 +840,16 @@ static int pcu_rx_susp_req(struct gsm_pcu_if_susp_req *susp_req) static int pcu_rx_app_info_req(struct gsm_pcu_if_app_info_req *app_info_req) { - GprsMs *ms; BTS *bts = BTS::main_bts(); struct gprs_rlcmac_bts *bts_data = bts->bts_data(); + struct llist_head *tmp; LOGP(DL1IF, LOGL_DEBUG, "Application Information Request received: type=0x%08x len=%i\n", app_info_req->application_type, app_info_req->len); bts_data->app_info_pending = 0; - llist_for_each_entry(ms, bts->ms_store().ms_list(), list) { + llist_for_each(tmp, bts->ms_store().ms_list()) { + GprsMs *ms = llist_entry(tmp, typeof(*ms), list); if (!ms_dl_tbf(ms)) continue; bts_data->app_info_pending++; diff --git a/src/pcu_vty_functions.cpp b/src/pcu_vty_functions.cpp index 92be77be..0276b3e3 100644 --- a/src/pcu_vty_functions.cpp +++ b/src/pcu_vty_functions.cpp @@ -207,10 +207,12 @@ static int show_ms(struct vty *vty, GprsMs *ms) int pcu_vty_show_ms_all(struct vty *vty, struct gprs_rlcmac_bts *bts_data) { BTS *bts = bts_data->bts; - GprsMs *ms_iter; + struct llist_head *tmp; - llist_for_each_entry(ms_iter, bts->ms_store().ms_list(), list) + llist_for_each(tmp, bts->ms_store().ms_list()) { + GprsMs *ms_iter = llist_entry(tmp, typeof(*ms_iter), list); show_ms(vty, ms_iter); + } return CMD_SUCCESS; }