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crypto: authenc - Fix crash with zero-length assoc data
The authenc code doesn't deal with zero-length associated data correctly and ends up constructing a zero-length sg entry which causes a crash when it's fed into the crypto system. This patch fixes this by avoiding the code-path that triggers the SG construction if we have no associated data. This isn't the most optimal fix as it means that we'll end up using the fallback code-path even when we could still execute the digest function. However, this isn't a big deal as nobody but the test path would supply zero-length associated data. Reported-by: Romain Francoise <email@example.com> Signed-off-by: Herbert Xu <firstname.lastname@example.org> Tested-by: Romain Francoise <email@example.com>
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