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authorJason A. Donenfeld <Jason@zx2c4.com>2015-11-24 10:28:00 +0000
committerJason A. Donenfeld <Jason@zx2c4.com>2015-11-24 10:31:43 +0000
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filter: avoid integer overflow in authenticate_post
ctx.env.content_length is an unsigned int, coming from the CONTENT_LENGTH environment variable, which is parsed by strtoul. The HTTP/1.1 spec says that "any Content-Length greater than or equal to zero is a valid value." By storing this into an int, we potentially overflow it, resulting in the following bounding check failing, leading to a buffer overflow. Reported-by: Erik Cabetas <Erik@cabetas.com> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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