جزئیات آسیب‌پذیری

In the Linux kernel, the following vulnerability has been resolved: smb: client: pin DFS superblock in iterator callback tcon_super_cb() stores a raw superblock pointer, but __cifs_get_super() takes its active reference only after iterate_supers_type() has dropped s_umount and its passive reference. Concurrent DFS automount expiry can therefore free the superblock before cifs_sb_active() uses it. A deterministic KASAN test reproduces the race as: BUG: KASAN: slab-use-after-free in cifs_sb_active+0x77/0x80 The same test passes with this change applied. Take the active reference in the callback while iterate_supers_type() still holds s_umount shared. cifs_put_tcp_super() remains the matching release.

• https://git.kernel.org/stable/c/3c9acc9835c304013a4faeb969fe9333d66ca9f8
• https://git.kernel.org/stable/c/ea43a15cea36dc5ddd832be5bddeac7dd804cbcf
• https://git.kernel.org/stable/c/a6b6561522212af852c9ad8a7dca8d59ef2c7377
• https://git.kernel.org/stable/c/5b01a8c0209690db75341528ec53fd87e0ac1460
• https://git.kernel.org/stable/c/d806d5a85dcbe2a0f181b2f0f9f61ddfbefa1818