Currently, the length of the server_audit_file_path system variable value is
not checked. This can cause a buffer overflow if given a long file path
specifying a directory as a memcpy() is performed to copy the entire file path into a
fixed size buffer, char alt_path_buffer[FN_REFLEN+1+DEFAULT_FILENAME_LEN];
Pull request: https://github.com/MariaDB/server/pull/3874
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Bug
Blocker
The patch is basically ok.
Test should be added and one more explanation.