To generate the patch for the given code slice with a CWE-787 (Out-of-bounds write) vulnerability, we can follow these reasoning steps:

### Step 1: Root Cause Analysis

- 1: Validate Memory Allocation:
  - The code allocates memory for `cmd` using `kmalloc`.
  - `kmalloc` does not initialize the allocated memory, which means it can contain arbitrary values.

- 2: Potential Vulnerability:
  - If the allocated memory is not initialized and is used without proper bounds checking, it can lead to out-of-bounds writes.
  - In this case, since `kmalloc` does not initialize the memory, using the allocated memory without proper initialization can lead to undefined behavior.

- 3: CWE-787 Vulnerability:
  - CWE-787 is an out-of-bounds write vulnerability, which can occur when data is written to a memory location outside the intended buffer.
  - In this case, if the allocated memory is not properly initialized and is used without bounds checking, it can lead to an out-of-bounds write.

### Conclusion:
The vulnerable behavior in this code is an out-of-bounds write. It occurs because the allocated memory is not initialized, and it is used without proper bounds checking. To fix this vulnerability, we need to ensure that the allocated memory is properly initialized.

### Step 2: Fixing Strategy

- A common fixing strategy for this vulnerability is to use `kzalloc` instead of `kmalloc`.
- `kzalloc` initializes the allocated memory to zero, which ensures that the memory is properly initialized before use.
- By using `kzalloc`, we can prevent out-of-bounds writes caused by using uninitialized memory.

Therefore, the patch should be:
```
< 	cmd = kmalloc(sizeof(*cmd), GFP_ATOMIC);
---
> 	cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
```
This patch ensures that the allocated memory is properly initialized, preventing out-of-bounds writes and fixing the CWE-787 vulnerability.