CVE-2024-46840

In the Linux kernel, the following vulnerability has been resolved: btrfs: clean up our handling of refs == 0 in snapshot delete In reada we BUG_ON(refs == 0), which could be unkind since we aren't holding a lock on the extent leaf and thus could get a transient incorrect answer. In walk_down_proc we also BUG_ON(refs == 0), which could happen if we have extent tree corruption. Change that to return -EUCLEAN. In do_walk_down() we catch this case and handle it correctly, however we return -EIO, which -EUCLEAN is a more appropriate error code. Finally in walk_up_proc we have the same BUG_ON(refs == 0), so convert that to proper error handling. Also adjust the error message so we can actually do something with the information.

• linux linux kernel (< 4.19.322) • linux linux kernel (>= 4.20 < 5.4.284) • linux linux kernel (>= 5.5 < 5.10.226) • linux linux kernel (>= 5.11 < 5.15.167) • linux linux kernel (>= 5.16 < 6.1.110) • linux linux kernel (>= 6.2 < 6.6.51) • linux linux kernel (>= 6.7 < 6.10.10)