NULL pointer dereference in cal_ctx_v4l2_init_formats() in Kernel
Summary
GSD-2022-1001882: media: ti-vpe: cal: Fix a NULL pointer dereference in cal_ctx_v4l2_init_formats(). Affects Kernel versions >= 7168155002cf7aadbfaa14a28f037c880a214764, < aa613ac270292e102503e9767882e39200efe608. No fix is published. How to fix ↓
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Background
The Kernel is a fundamental component of the Linux operating system that acts as a bridge between the hardware and software layers. It provides essential functionalities and services to enable the proper functioning of the system. The vulnerability in question affects the media: ti-vpe: cal component of the Kernel. This component is responsible for managing the Camera Access Layer (CAL) for Texas Instruments Video Processing Engine (TI-VPE). The CAL module handles the initialization and configuration of video formats for the TI-VPE hardware. However, a NULL pointer dereference vulnerability exists in the cal_ctx_v4l2_init_formats() function, which can lead to unexpected behavior or system crashes.
Vulnerability Detail
The NULL pointer dereference vulnerability in cal_ctx_v4l2_init_formats() arises from a failure to properly handle a NULL pointer. When the function is called, it does not check if a pointer is NULL before attempting to dereference it. As a result, if a NULL pointer is passed as an argument, the function will crash, leading to a denial of service (DoS) condition. An attacker could potentially exploit this vulnerability by providing malicious input to trigger the NULL pointer dereference, causing the system to crash or become unresponsive. The impact of this vulnerability can range from a temporary disruption in service to a complete system halt, depending on the context in which the vulnerable code is executed.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can avoid the vulnerability by refraining from executing code that triggers the cal_ctx_v4l2_init_formats() function with a NULL pointer argument. This can be achieved by ensuring that all input values passed to the function are valid and non-NULL. Here is an example of how to validate the input before calling the function:
if (input_pointer != NULL) {
cal_ctx_v4l2_init_formats(input_pointer);
}
Conclusion
In conclusion, the NULL pointer dereference vulnerability in cal_ctx_v4l2_init_formats() in the Kernel's media: ti-vpe: cal component can lead to system crashes or unresponsiveness. It is crucial to update the Linux Kernel to version v5.15.33 or later to mitigate this vulnerability. Additionally, validating input values before calling the vulnerable function can serve as a temporary workaround. For further assistance or support in addressing this vulnerability, please contact DevNack.com.
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FAQ
The impact of this vulnerability can range from a temporary disruption in service to a complete system halt, depending on the context in which the vulnerable code is executed.
An attacker could potentially exploit this vulnerability by providing malicious input to trigger the NULL pointer dereference, causing the system to crash or become unresponsive.
Yes, the vulnerability has been fixed in Linux Kernel version v5.15.33. It is recommended to update to this version or later to address the issue.
Yes, users can avoid the vulnerability by ensuring that all input values passed to the cal_ctx_v4l2_init_formats() function are valid and non-NULL.
For more details about this vulnerability, you can refer to the source link provided in the database_specific section of this report.
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