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Steven Rostedt (VMware) authored
The regex match function regex_match_front() in the tracing filter logic, was fixed to test just the pattern length from testing the entire test string. That is, it went from strncmp(str, r->pattern, len) to strcmp(str, r->pattern, r->len). The issue is that str is not guaranteed to be nul terminated, and if r->len is greater than the length of str, it can access more memory than is allocated. The solution is to add a simple test if (len < r->len) return 0. Cc: stable@vger.kernel.org Fixes: 285caad4 ("tracing/filters: Fix MATCH_FRONT_ONLY filter matching") Signed-off-by:
Steven Rostedt (VMware) <rostedt@goodmis.org>
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