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Summary of ChangesHello @Raquezin, 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 introduces essential functionality for saving and loading matrix data to and from binary files. This enhancement allows for the persistence of matrix states, enabling users to store complex matrix structures and retrieve them later, which is crucial for applications requiring data retention or inter-process data exchange. The changes include updates to error handling and the core matrix library to support these new operations. Highlights
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Code Review
This pull request introduces functionality to save and load matrices to/from binary files. While this is a valuable addition, the current implementation contains several critical vulnerabilities related to file handling. Specifically, the functions lack proper error checking for I/O operations (fread and fwrite) and memory allocation, which can lead to silent data corruption, crashes from null pointer dereferences, and incorrect error reporting. I've provided detailed comments and suggestions in src/matrix.c to address these critical issues and make the file operations robust and safe.
| ErrorCode save_matrix(const Matrix a, const char* filename) { | ||
| FILE* f = fopen(filename, "wb"); | ||
| if (!f) return ERR_FILE_NOT_FOUND; | ||
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| fwrite(&a.row, sizeof(int), 1, f); | ||
| fwrite(&a.col, sizeof(int), 1, f); | ||
| fwrite(a.data, sizeof(float), a.row * a.col, f); | ||
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| fclose(f); | ||
| return ERR_NONE; | ||
| } |
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The current implementation does not check the return value of fwrite. If a write operation fails (e.g., disk is full), the function will report success (ERR_NONE), but the resulting file will be corrupted. This can lead to silent data loss. All I/O operations should have their results checked. It would also be beneficial to add a more specific error code, like ERR_FILE_WRITE, to errores.h for this case.
ErrorCode save_matrix(const Matrix a, const char* filename) {
FILE* f = fopen(filename, "wb");
if (!f) {
return ERR_FILE_NOT_FOUND;
}
if (fwrite(&a.row, sizeof(int), 1, f) != 1) {
fclose(f);
return ERR_FILE_NOT_FOUND;
}
if (fwrite(&a.col, sizeof(int), 1, f) != 1) {
fclose(f);
return ERR_FILE_NOT_FOUND;
}
size_t elements = (size_t)a.row * a.col;
if (elements > 0 && fwrite(a.data, sizeof(float), elements, f) != elements) {
fclose(f);
return ERR_FILE_NOT_FOUND;
}
fclose(f);
return ERR_NONE;
}| Matrix load_matrix(const char* filename, ErrorCode* err) { | ||
| FILE* f = fopen(filename, "rb"); | ||
| if (!f) { | ||
| *err = ERR_NONE; | ||
| return default_matrix; | ||
| } | ||
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| int rows, cols; | ||
| fread(&rows, sizeof(int), 1, f); | ||
| fread(&cols, sizeof(int), 1, f); | ||
| Matrix m = create_matrix(rows, cols, 0.0f); | ||
| fread(m.data, sizeof(float), rows * cols, f); | ||
| fclose(f); | ||
| *err = ERR_NONE; | ||
| return m; | ||
| } |
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The implementation of load_matrix has several critical flaws that can lead to incorrect behavior, silent failures, and crashes:
- Incorrect Error on
fopenFailure: If the file cannot be opened,*erris set toERR_NONE, misleading the caller. It should beERR_FILE_NOT_FOUND. - Unchecked
freadCalls: The return values offreadare ignored. If the file is corrupted or incomplete, the function may proceed with garbage data, leading to undefined behavior. - Unhandled
create_matrixFailure: Ifcreate_matrixfails (e.g., due to invalid dimensions or memory allocation failure), it returns a matrix with aNULLdata pointer. The subsequentfreadcall will then cause a segmentation fault.
The function should be rewritten to handle these error conditions robustly. It would also be beneficial to add more specific error codes for file read and memory allocation errors toerrores.h.
Matrix load_matrix(const char* filename, ErrorCode* err) {
FILE* f = fopen(filename, "rb");
if (!f) {
*err = ERR_FILE_NOT_FOUND;
return default_matrix;
}
int rows, cols;
if (fread(&rows, sizeof(int), 1, f) != 1) {
fclose(f);
*err = ERR_FILE_NOT_FOUND;
return default_matrix;
}
if (fread(&cols, sizeof(int), 1, f) != 1) {
fclose(f);
*err = ERR_FILE_NOT_FOUND;
return default_matrix;
}
Matrix m = create_matrix(rows, cols, 0.0f);
if (m.data == NULL) { // Check if create_matrix failed
fclose(f);
*err = ERR_FILE_NOT_FOUND; // A more specific memory error would be better
return default_matrix;
}
size_t elements = (size_t)rows * cols;
if (elements > 0 && fread(m.data, sizeof(float), elements, f) != elements) {
fclose(f);
*err = ERR_FILE_NOT_FOUND;
return default_matrix;
}
fclose(f);
*err = ERR_NONE;
return m;
}1 participant
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