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minor: add checks on configurations and functions

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these checks prevent out of bounds access and running
unset function pointers.

Change-Id: Ida889d40b898fc1ab8b885800431833570fdaafe
This commit is contained in:
Kévin Redon
2018-09-06 22:46:54 +02:00
parent 1dbcf62295
commit 7d5d011095
1 changed files with 17 additions and 5 deletions
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22
firmware/apps/cardem/main.c
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@@ -101,7 +101,11 @@ static volatile enum confNum simtrace_config = CFG_NUM_CCID;
void USBDDriverCallbacks_ConfigurationChanged(uint8_t cfgnum)
{
TRACE_INFO_WP("cfgChanged%d ", cfgnum);
simtrace_config = cfgnum;
if (cfgnum < ARRAY_SIZE(config_func_ptrs)) {
simtrace_config = cfgnum;
} else {
TRACE_ERROR("trying to set out of bounds config %u\r\n", cfgnum);
}
}
void USART1_IrqHandler(void)
@@ -204,7 +208,9 @@ extern int main(void)
}
TRACE_INFO("calling init of config %u...\n\r", simtrace_config);
config_func_ptrs[simtrace_config].init();
if (config_func_ptrs[simtrace_config].init) {
config_func_ptrs[simtrace_config].init();
}
last_simtrace_config = simtrace_config;
TRACE_INFO("entering main loop...\n\r");
@@ -232,11 +238,17 @@ extern int main(void)
if (last_simtrace_config != simtrace_config) {
TRACE_INFO("USB config chg %u -> %u\n\r",
last_simtrace_config, simtrace_config);
config_func_ptrs[last_simtrace_config].exit();
config_func_ptrs[simtrace_config].init();
if (config_func_ptrs[last_simtrace_config].exit) {
config_func_ptrs[last_simtrace_config].exit();
}
if (config_func_ptrs[simtrace_config].init) {
config_func_ptrs[simtrace_config].init();
}
last_simtrace_config = simtrace_config;
} else {
config_func_ptrs[simtrace_config].run();
if (config_func_ptrs[simtrace_config].run) {
config_func_ptrs[simtrace_config].run();
}
}
}
}