net: dsa: sja1105: fix kasan out-of-bounds warning in sja1105_table_delete_entry()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: net: dsa: sja1105: fix kasan out-of-bounds warning in sja1105_table_delete_entry() There are actually 2 problems: - deleting the last element doesn't require the memmove of elements [i + 1, end) over it. Actually, element i+1 is out of bounds. - The memmove itself should move size - i - 1 elements, because the last element is out of bounds. The out-of-bounds element still remains out of bounds after being accessed, so the problem is only that we touch it, not that it becomes in active use. But I suppose it can lead to issues if the out-of-bounds element is part of an unmapped page.

References

• https://git.kernel.org/stable/c/f85b9bfb08ba2b642d1810c6c4ae1e7b46f1776a
• https://git.kernel.org/stable/c/f117d0467215d7f1d445ae16d2c799637e63dc6c
• https://git.kernel.org/stable/c/b52153da1f42e2f4d6259257a7ba027331671a93
• https://git.kernel.org/stable/c/4584486cfcca24b7b586da3377eb3cffd48669ec
• https://git.kernel.org/stable/c/031e00249e9e6bee72ba66701c8f83b45fc4b8a2
• https://git.kernel.org/stable/c/59b97641de03c081f26b3a8876628c765b5faa25
• https://git.kernel.org/stable/c/5f2b28b79d2d1946ee36ad8b3dc0066f73c90481