CVE-2024-36966

In the Linux kernel, the following vulnerability has been resolved: erofs:
reliably distinguish block based and fscache mode When erofs_kill_sb() is
called in block dev based mode, s_bdev may not have been initialised yet,
and if CONFIG_EROFS_FS_ONDEMAND is enabled, it will be mistaken for fscache
mode, and then attempt to free an anon_dev that has never been allocated,
triggering the following warning:
============================================ ida_free called for id=0 which
is not allocated. WARNING: CPU: 14 PID: 926 at lib/idr.c:525
ida_free+0x134/0x140 Modules linked in: CPU: 14 PID: 926 Comm: mount Not
tainted 6.9.0-rc3-dirty #630 RIP: 0010:ida_free+0x134/0x140 Call Trace:
<TASK> erofs_kill_sb+0x81/0x90 deactivate_locked_super+0x35/0x80
get_tree_bdev+0x136/0x1e0 vfs_get_tree+0x2c/0xf0 do_new_mount+0x190/0x2f0
[…] ============================================ Now when erofs_kill_sb()
is called, erofs_sb_info must have been initialised, so use sbi->fsid to
distinguish between the two modes.