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Potential security issue in lib/sendf.c: Unchecked return from initialization function #5413

monocle-ai opened this issue May 18, 2020 · 0 comments


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What is a Conditionally Uninitialized Variable? The return value of a function that is potentially used to initialize a local variable is not checked. Therefore, reading the local variable may result in undefined behavior.

1 instance of this defect were found in the following locations:

Instance 1
File : lib/sendf.c
Function: curl_mvsnprintf

mvsnprintf(error, CURL_ERROR_SIZE, fmt, ap);

Code extract:

    size_t len;
    char error[CURL_ERROR_SIZE + 2];
    va_start(ap, fmt);
    mvsnprintf(error, CURL_ERROR_SIZE, fmt, ap); <------ HERE
    len = strlen(error);

How can I fix it?
Correct reference usage found in lib/sendf.c at line 241.

len = mvsnprintf(print_buffer, sizeof(print_buffer), fmt, ap);

Code extract:

    size_t len;
    char print_buffer[2048 + 1];
    va_start(ap, fmt);
    len = mvsnprintf(print_buffer, sizeof(print_buffer), fmt, ap); <------ HERE
     * Indicate truncation of the input by replacing the last 3 characters
bagder added a commit that referenced this issue May 18, 2020
... and avoid a strlen() call. Fixes a MonocleAI warning.

Reported-by: MonocleAI
Fixes #5413
@bagder bagder closed this as completed in 7462355 May 19, 2020
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