CVE-2023-53722

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

md: raid1: fix potential OOB in raid1_remove_disk()

If rddev->raid_disk is greater than mddev->raid_disks, there will be an out-of-bounds in raid1_remove_disk(). We have already found similar reports as follows:

1. commit d17f744e883b (md-raid10: fix KASAN warning)
2. commit 1ebc2cec0b7d (dm raid: fix KASAN warning in raid5_remove_disk)

Fix this bug by checking whether the number variable is valid.

References

• https://git.kernel.org/stable/c/25a68f2286be56fb3a6f9fa0e269c04b5e6c6e24
• https://git.kernel.org/stable/c/4bdb92eaf645e312975357adc3c4e9523b6e67f1
• https://git.kernel.org/stable/c/4f7d853b4590fc20e90dd50e346c02811a8c5b08
• https://git.kernel.org/stable/c/4f96c0665f9f4cf70130c9757750dc43dc679c82
• https://git.kernel.org/stable/c/7993cfc041481a3a9cd4a3858088fc846b8ccaf7
• https://git.kernel.org/stable/c/8b0472b50bcf0f19a5119b00a53b63579c8e1e4d
• https://git.kernel.org/stable/c/91fbd4e75cb573f44d2619a9dc2f9ba927040760
• https://git.kernel.org/stable/c/beedf40f73939f248c81802eda08a2a8148ea13e