Potential integer overflow in sds.c

[Crispy-fried-chicken]

The sdsnewlen and sdsMakeRoomFor function implemented in sds.c is quite similiar to those in the redis. Thus, it's very likely that this integer overflow in CVE-2021-21309 also affects sds.
Would you can help to check if this bug is true? If it's true, I'd like to open a PR for that if necessary. Thank you for your effort and patience!
And here is the patch for CVE-2021-21309 for your reference if this issue needs to be fixed.