Herbert Xu [off-list ref] writes:

Thanks! I think this patch should fix the problem.  Can someone
please confirm this?

Works for me as well, thanks!

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 <redacted>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Feel free to change this to:

Reported-and-tested-by: Romain Francoise <redacted>