catch error when http init fails from bad url to avoid barf. #48
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Summary of Changes
Hello @tavdog, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request primarily enhances the robustness of network communication by implementing crucial error handling for HTTP client initialization failures. It ensures that the application can gracefully manage scenarios where invalid URLs or other issues prevent the HTTP client from being set up correctly, preventing crashes and improving overall stability. Additionally, a minor code style improvement was applied to a WiFi-related function.
Highlights
- Error Handling for HTTP Client Initialization: Implemented a null check for the
esp_http_client_handle_treturned byesp_http_client_initinremote_get. This prevents potential crashes by logging an error, freeing allocated resources (state.buf), and returning an error code if the HTTP client fails to initialize, particularly when an invalid URL is provided. - Code Style Improvement: A minor formatting adjustment was made to the
wifi_initializefunction signature insrc/wifi.cfor better readability and conciseness.
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Code Review
This pull request primarily addresses an error handling scenario in src/remote.c by adding a check for failures during HTTP client initialization (esp_http_client_init). This prevents potential issues, such as crashes, when an invalid URL is used. The change includes logging the error, freeing an associated buffer, and returning an error code. Additionally, a minor stylistic formatting change is made in src/wifi.c for function signature readability.
| if (http == NULL) { | ||
| ESP_LOGE(TAG, "HTTP client initialization failed for URL: %s", url); | ||
| free(state.buf); | ||
| return 1; | ||
| } |
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The addition of the null check for the http client handle is a crucial improvement for robustness, preventing potential crashes if esp_http_client_init fails (e.g., due to a malformed URL).
Regarding the free(state.buf); call on line 164:
For this operation to be safe and correct, state.buf must satisfy one of the following conditions at this point:
- It is
NULL. Callingfree(NULL)is a safe no-operation. This is typically the case if thestatestruct instance (whichstate.bufis a member of) was zero-initialized (e.g.,http_state_t state = {0};) andstate.bufhas not yet been allocated by the HTTP event handler (which wouldn't have run ifinitfailed). - It is a valid pointer to heap-allocated memory that was provisioned before
esp_http_client_initwas called and now needs to be explicitly freed in this error path to prevent a memory leak.
If state.buf could hold an uninitialized garbage value (e.g., if the state struct was a stack variable that wasn't initialized), calling free() on it would result in undefined behavior.
Please ensure that the state variable is managed such that state.buf is always in a valid state (either NULL or a valid heap pointer) before this free() call. If state.buf is expected to be NULL here because it's only allocated within the event handler, the free() call is benignly redundant but safe if state was zero-initialized.
fixes #45