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SubjectRe: [PATCH][next] net/tls: fix sign extension issue when left shifting u16 value
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On 6/30/2020 5:27 PM, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.com>
>
> Left shifting the u16 value promotes it to a int and then it
> gets sign extended to a u64. If len << 16 is greater than 0x7fffffff
> then the upper bits get set to 1 because of the implicit sign extension.
> Fix this by casting len to u64 before shifting it.
>
> Addresses-Coverity: ("integer handling issues")
> Fixes: ed9b7646b06a ("net/tls: Add asynchronous resync")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
> include/net/tls.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/net/tls.h b/include/net/tls.h
> index c875c0a445a6..e5dac7e74e79 100644
> --- a/include/net/tls.h
> +++ b/include/net/tls.h
> @@ -637,7 +637,7 @@ tls_offload_rx_resync_async_request_start(struct sock *sk, __be32 seq, u16 len)
> struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx);
>
> atomic64_set(&rx_ctx->resync_async->req, ((u64)ntohl(seq) << 32) |
> - (len << 16) | RESYNC_REQ | RESYNC_REQ_ASYNC);
> + ((u64)len << 16) | RESYNC_REQ | RESYNC_REQ_ASYNC);
> rx_ctx->resync_async->loglen = 0;
> }
>
>

Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Thanks!

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