thodg/libgit2/src/streams

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  • Hash : 0ceac0d0
    Author : Patrick Steinhardt
    Date : 2019-01-23T14:45:19

    mbedtls: fix potential size overflow when reading or writing data The mbedtls library uses a callback mechanism to allow downstream users to plug in their own receive and send functions. We implement `bio_read` and `bio_write` functions, which simply wrap the `git_stream_read` and `git_stream_write` functions, respectively. The problem arises due to the return value of the callback functions: mbedtls expects us to return an `int` containing the actual number of bytes that were read or written. But this is in fact completely misdesigned, as callers are allowed to pass in a buffer with length `SIZE_MAX`. We thus may be unable to represent the number of bytes written via the return value. Fix this by only ever reading or writing at most `INT_MAX` bytes.

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