https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259024
Bug ID: 259024
Summary: ext2_search_dirblock() loops forever if e2d_reclen is
zero
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 228539
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=228539&action=edit
An ext3 disk image that causes ext2_search_dirblock() to loop forever.
The code in ext2_search_dirblock() that handles e2d_reclen == 0
doesn't increment ep, and thus loops forever.
I've attached a demo:
% gunzip ext34.img.gz
% sudo mdconfig -f ext34.img
% sudo mount -t ext2fs -o ro /dev/md0 /mnt
% sudo cp /mnt/a /dev/null
<the lookup never finishes>
FreeBSD unmatched 14.0-CURRENT FreeBSD 14.0-CURRENT #0
main-n249571-b5f90655ea3: Thu Sep 23 06:10:05 UTC 2021
[email protected]:/usr/obj/usr/src/riscv.riscv64/sys/GENERIC riscv
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