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nimble/ll: Fix NULL pointer dereference in ble_ll_sched_rmv_elem_type #2083

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nimble/ll: Fix NULL pointer dereference in ble_ll_sched_rmv_elem_type #2083

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7 changes: 5 additions & 2 deletions nimble/controller/src/ble_ll_sched.c
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Original file line number Diff line number Diff line change
Expand Up @@ -930,10 +930,13 @@ ble_ll_sched_rmv_elem_type(uint8_t type, sched_remove_cb_func remove_cb)
OS_ENTER_CRITICAL(sr);

first = TAILQ_FIRST(&g_ble_ll_sched_q);
if (first->sched_type == type) {
first_removed = 1;
if (!first) {
OS_EXIT_CRITICAL(sr);
return;
}

first_removed = first->sched_type == type;

TAILQ_FOREACH(entry, &g_ble_ll_sched_q, link) {
if (entry->sched_type != type) {
continue;
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