To generate this patch, we can follow these reasoning steps:

Step 1. Root Cause Analysis:

1. Input Validation:
   - The code reads `table_size` from user input.
   - There's a check to ensure `table_size` doesn't cause an integer overflow when calculating `full_size`.

2. Memory Allocation:
   - `full_size` is calculated based on `table_size`.
   - Memory is allocated using `kmalloc(full_size, GFP_USER)`.

3. Potential Vulnerability:
   - `kmalloc` allocates uninitialized memory.
   - Uninitialized memory can contain sensitive data from previous allocations.
   - If this memory is later accessed or copied to user space without being fully initialized, it could lead to information leakage.

4. Vulnerability Classification:
   - This is not strictly a CWE-787 (Out-of-bounds Write) vulnerability.
   - It's more accurately a potential information leakage vulnerability due to uninitialized memory use.

Step 2. Fixing Strategy:

1. Mitigation Approach:
   - To prevent potential information leakage, we should ensure the allocated memory is initialized.

2. Function Selection:
   - `kzalloc` is a kernel function that allocates and zeroes out memory.
   - Using `kzalloc` instead of `kmalloc` will ensure the allocated memory is initialized to zero.

3. Patch Formulation:
   - Replace `kmalloc` with `kzalloc`, keeping the same arguments.

Conclusion:
The patch replaces `kmalloc` with `kzalloc` to ensure the allocated memory is initialized, preventing potential information leakage:

```
<     indir = kmalloc(full_size, GFP_USER);
---
>     indir = kzalloc(full_size, GFP_USER);
```

This patch addresses the potential vulnerability by initializing the allocated memory, preventing any unintended information disclosure.