[hle] Fix crash on MK8D and SM3DW LDN (#4417)

Crash is due to SIGILL due to mismatched N and span<> ctor().
Also some astray nullptr references.

Signed-off-by: lizzie <lizzie@eden-emu.dev>

- [x] I have read and followed the [Contribution Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/CONTRIBUTING.md#code-contributions).
- [x] I have read and followed the [AI Policy](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/AI.md)
- [x] I have read and followed the [Coding Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/Coding.md) to the best of my ability.

-------------------

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4417
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: Maufeat <sahyno1996@gmail.com>

2 files changed, 3 insertions, 3 deletions

diff --git a/src/common/uuid.cpp b/src/common/uuid.cpp
index 51fe0abaa5..4b992c5df8 100644
--- a/src/common/uuid.cpp
+++ b/src/common/uuid.cpp
@@ -208,9 +208,9 @@ UUID UUID::MakeRandomRFC4122V4() {
     return uuid;
 }
 
-UUID UUID::MakeRFC4122V5(std::span<u8, 20> sha1) {
+UUID UUID::MakeRFC4122V5(std::span<u8, 16> sha1) {
     UUID uuid{};
-    std::memcpy(&uuid.uuid, sha1.data(), sizeof(UUID));
+    std::memcpy(&uuid.uuid, sha1.data(), sha1.size());
     uuid.uuid[8] = 0x80 | (uuid.uuid[8] & 0x3F);
     uuid.uuid[6] = 0x50 | (uuid.uuid[6] & 0xF);
     return uuid;
diff --git a/src/common/uuid.h b/src/common/uuid.h
index 3aa3212dd7..465b5be58d 100644
--- a/src/common/uuid.h
+++ b/src/common/uuid.h
@@ -104,7 +104,7 @@ struct UUID {
     /// @returns A random UUID that is RFC 4122 Version 4 compliant.
     [[nodiscard]] static UUID MakeRandomRFC4122V4();
 
-    [[nodiscard]] static UUID MakeRFC4122V5(std::span<u8, 20> sha1);
+    [[nodiscard]] static UUID MakeRFC4122V5(std::span<u8, 16> sha1);
 
     friend constexpr bool operator==(const UUID& lhs, const UUID& rhs) = default;
 };