[Bug 219481] New: Buffer overflow vulnerability in btusb_write()

[Bug 219481] New: Buffer overflow vulnerability in btusb_write()

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=219481

            Bug ID: 219481
           Summary: Buffer overflow vulnerability in btusb_write()
           Product: Drivers
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Bluetooth
          Assignee: linux-bluetooth@vger.kernel.org
          Reporter: sushilkumardeveloper@gmail.com
        Regression: No

Created attachment 307171
  --> https://bugzilla.kernel.org/attachment.cgi?id=307171&action=edit
Bug: A buffer overflow vulnerability in the Bluetooth subsystem.   Location:
drivers/bluetooth/btusb.c      This is Code with bug

Bug Report: Buffer Overflow Vulnerability in `btusb_write` Function
>>      
Summary:
A buffer overflow vulnerability has been identified in the `btusb_write`
function within the Bluetooth subsystem of the Linux kernel
(`drivers/bluetooth/btusb.c`). The function does not properly validate the size
of the data being written, which may lead to a potential buffer overflow.
>>
Location:
- File: `drivers/bluetooth/btusb.c`
- Function: `btusb_write`
>>
Description:
The current implementation of the `btusb_write` function performs a check to
ensure that the `count` (number of bytes to write) does not exceed 64 bytes.
However, it does not perform any additional validation to ensure that the
`count` value is a positive integer. This can lead to unexpected behavior,
including potential buffer overflow, if the `count` is zero or negative.
>>
Issue:
- The check `if (count > 64)` ensures that the count does not exceed 64 bytes,
but it does not validate that `count` is a positive number.
- If `count` is zero or negative, the behavior is undefined, potentially
leading to a buffer overflow, memory corruption, or other unexpected behavior.
>>
Proposed Fix:
Add an additional check to ensure that `count` is greater than zero before
proceeding with the write operation. This will prevent the possibility of
passing an invalid `count` value (i.e., zero or negative).
>>

Explanation:
- The additional condition `if (count <= 0)` ensures that the write operation
will not proceed if the `count` is zero or negative, which could have resulted
in an invalid memory access or other undefined behavior.
- This fix improves the robustness of the function by properly validating the
`count` value before using it in the `btusb_submit_cmd` function.
>>
Impact:
This bug could potentially lead to security vulnerabilities or crashes if
negative or zero values are passed to the `btusb_write` function. The proposed
fix mitigates the risk of buffer overflows by ensuring that only valid sizes
are used for data writing operations.
>>
Steps to Reproduce:
1. Clone the Linux kernel source code (`git clone
https://github.com/torvalds/linux.git`).
2. Locate the function `btusb_write` in `drivers/bluetooth/btusb.c`.
3. Provide an invalid value (e.g., zero or negative) for `count` when calling
the function.
4. Observe that the function may fail to handle the invalid size appropriately,
potentially causing undefined behavior.
>>
Patch Available:  
Yes. A patch has been proposed in the "Corrected Code" section above.
>>
Additional Notes:
This issue was identified using static analysis tools, but it may not have been
readily apparent during regular testing or use. It's recommended that this bug
be fixed to ensure the stability and security of the Bluetooth subsystem.

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[Bug 219481] Buffer overflow vulnerability in btusb_write()

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https://bugzilla.kernel.org/show_bug.cgi?id=219481

Luiz Von Dentz (luiz.dentz@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |luiz.dentz@gmail.com

--- Comment #1 from Luiz Von Dentz (luiz.dentz@gmail.com) ---
There doesn't seem to be any function called btusb (git grep btusb_write), so
what are you talking about?

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[Bug 219481] Buffer overflow vulnerability in btusb_write()

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https://bugzilla.kernel.org/show_bug.cgi?id=219481

Artem S. Tashkinov (aros@gmx.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

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[Bug 219481] Buffer overflow vulnerability in btusb_write()

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https://bugzilla.kernel.org/show_bug.cgi?id=219481

--- Comment #2 from Artem S. Tashkinov (aros@gmx.com) ---
The only reference to this function that google finds is 

http://www.datashed.science/misc/bcm/gpl/broadcom-sdk-416L05/bcmdrivers/opensource/char/btusb/impl1/src/btusb_dev.c

This is not found in the current Linux kernel.

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