CVE-2021-47159

In the Linux kernel, the following vulnerability has been resolved:

net: dsa: fix a crash if ->get_sset_count() fails

If ds->ops->get_sset_count() fails then it count is a negative error code such as -EOPNOTSUPP. Because i is an unsigned int, the negative error code is type promoted to a very high value and the loop will corrupt memory until the system crashes.

Fix this by checking for error codes and changing the type of i to just int.

Weakness

The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.

Affected Software

References

• https://git.kernel.org/stable/c/0f2cb08c57edefb0e7b5045e0e3e9980a3d3aa37
• https://git.kernel.org/stable/c/7b22466648a4f8e3e94f57ca428d1531866d1373
• https://git.kernel.org/stable/c/a269333fa5c0c8e53c92b5a28a6076a28cde3e83
• https://git.kernel.org/stable/c/caff86f85512b8e0d9830e8b8b0dfe13c68ce5b6
• https://git.kernel.org/stable/c/ce5355f140a7987011388c7e30c4f8fbe180d3e8
• https://git.kernel.org/stable/c/0f2cb08c57edefb0e7b5045e0e3e9980a3d3aa37
• https://git.kernel.org/stable/c/7b22466648a4f8e3e94f57ca428d1531866d1373
• https://git.kernel.org/stable/c/a269333fa5c0c8e53c92b5a28a6076a28cde3e83
• https://git.kernel.org/stable/c/caff86f85512b8e0d9830e8b8b0dfe13c68ce5b6
• https://git.kernel.org/stable/c/ce5355f140a7987011388c7e30c4f8fbe180d3e8