bug in hkdf code #81
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bug in hkdf code #81
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IIRC I also already stumbled (at least once) over that line... IIUC is this line correct. It errors-out in case the pointer is NULL but the length is not. But it made me look at further access of the pointer and then I found http://stackoverflow.com/a/5243068 |
Don't call XMEMCPY() in case info (the source parameter to memcpy) is NULL as this would trigger UB
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At
https://github.com/libtom/libtomcrypt/blob/develop/src/misc/hkdf/hkdf.c#L55
That should be an || not && comparison. Now if the pointer is null but the length is not the XMEMCPY later will dereference a NULL pointer.