md/raid10: check slab-out-of-bounds in md_bitmap_get_counter

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: md/raid10: check slab-out-of-bounds in md_bitmap_get_counter If we write a large number to md/bitmap_set_bits, md_bitmap_checkpage() will return -EINVAL because 'page >= bitmap->pages', but the return value was not checked immediately in md_bitmap_get_counter() in order to set *blocks value and slab-out-of-bounds occurs. Move check of 'page >= bitmap->pages' to md_bitmap_get_counter() and return directly if true.

References

• https://git.kernel.org/stable/c/374fb914304d9b500721007f3837ea8f1f9a2418
• https://git.kernel.org/stable/c/b0b971fe7d61411ede63c3291764dbde1577ef2c
• https://git.kernel.org/stable/c/39fa14e824acfd470db4f42c354297456bd82b53
• https://git.kernel.org/stable/c/a134dd582c0d5b6068efa308bd485cf1d00b3f65
• https://git.kernel.org/stable/c/be1a3ec63a840cc9e59a033acf154f56255699a1
• https://git.kernel.org/stable/c/152bb26796ff054af50b2ee1b3ca56e364e4f61b
• https://git.kernel.org/stable/c/bea301c046110bf421a3ce153fb868cb8d618e90
• https://git.kernel.org/stable/c/301867b1c16805aebbc306aafa6ecdc68b73c7e5