[sr-dev] [kamailio/kamailio] Modules: db_redisusrloc for usrloc module (#1446)

[Daniel-Constantin Mierla]

Just looked quickly a bit ...

I spotted some sprintf() which are unsafe, especially when dealing with DB string or blobs, the target buffer is 255 bytes in size, but I haven't seen any check of input size.

This snippet needs some checks as well, for allocated pointer and snprintf:

```
+			int username_size=VAL_STR(tval).len+1*sizeof(char);
+			username = (char*)pkg_malloc(username_size);
+			snprintf(username,username_size,"%s",VAL_STR(tval).s);
```

`pkg_strdup()` can return NULL, but that is not checked -- although, I didn't looked more to see if it always safe to work further if the return is NULL there.

I will ask to see if anyone else can do additional work to review. If not, as I said, I do not have anything against merging it.

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