Comment 11 for bug 655463
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Additional analysis from <email address hidden>:
I'm not completely sure, but this is what I see so far. The bug can only occur when the second argument to strstr (the needle) is periodic, which is to say that it consists entirely of some repeated string. When that happens, the code can fail to match if the first argument to strstr (the haystack) contains two or more repetitions of the needle's periodic string, but not as many as the number of occurrences as are in the needle. In that case strstr can sometimes return a pointer to the smaller number of repetitions, when it should properly return NULL or a later pointer. Also, the needle has to be 32 bytes or more.