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Fix memory leak on error path in register_select 

And remove dead error handling code from unregister_select.

Closes https://github.com/espressif/esp-idf/pull/7296
pull/7325/head
Alex Henrie 2021-07-20 13:52:53 -06:00 zatwierdzone przez Aditya Patwardhan
rodzic 5242e048d4
commit d4ff9ab266
1 zmienionych plików z 6 dodań i 7 usunięć
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13
components/vfs/vfs_uart.c
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@ -363,9 +363,11 @@ static esp_err_t register_select(uart_select_args_t *args)
if (args) {
portENTER_CRITICAL(&s_registered_select_lock);
const int new_size = s_registered_select_num + 1;
if ((s_registered_selects = realloc(s_registered_selects, new_size * sizeof(uart_select_args_t *))) == NULL) {
uart_select_args_t **new_selects;
if ((new_selects = realloc(s_registered_selects, new_size * sizeof(uart_select_args_t *))) == NULL) {
ret = ESP_ERR_NO_MEM;
} else {
s_registered_selects = new_selects;
s_registered_selects[s_registered_select_num] = args;
s_registered_select_num = new_size;
ret = ESP_OK;
@ -389,12 +391,9 @@ static esp_err_t unregister_select(uart_select_args_t *args)
// last item.
s_registered_selects[i] = s_registered_selects[new_size];
s_registered_selects = realloc(s_registered_selects, new_size * sizeof(uart_select_args_t *));
if (s_registered_selects || new_size == 0) {
s_registered_select_num = new_size;
ret = ESP_OK;
} else {
ret = ESP_ERR_NO_MEM;
}
// Shrinking a buffer with realloc is guaranteed to succeed.
s_registered_select_num = new_size;
ret = ESP_OK;
break;
}
}