[PATCH] lib/crypto/poly1305: Fix arm64's poly1305_blocks_arch()

[Eric Biggers]

On Sun, Jun 15, 2025 at 06:06:54PM -0700, Eric Biggers wrote:
> From: Eric Biggers <ebiggers at google.com>
> 
> For some reason arm64's Poly1305 code got changed to ignore the padbit
> argument.  As a result, the output is incorrect when the message length
> is not a multiple of 16 (which is not reached with the standard
> ChaCha20Poly1305, but bcachefs could reach this).  Fix this.
> 
> Fixes: a59e5468a921 ("crypto: arm64/poly1305 - Add block-only interface")
> Reported-by: Kent Overstreet <kent.overstreet at linux.dev>
> Signed-off-by: Eric Biggers <ebiggers at google.com>
> ---
>  arch/arm64/lib/crypto/poly1305-glue.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux.git/log/?h=libcrypto-fixes

- Eric