isofs: Fix unbounded recursion when processing relocated directories
We did not check relocated directory in any way when processing Rock
Ridge 'CL' tag. Thus a corrupted isofs image can possibly have a CL
entry pointing to another CL entry leading to possibly unbounded
recursion in kernel code and thus stack overflow or deadlocks (if there
is a loop created from CL entries).
Fix the problem by not allowing CL entry to point to a directory entry
with CL entry (such use makes no good sense anyway) and by checking
whether CL entry doesn't point to itself.
Reported-by: Chris Evans <email@example.com>
Signed-off-by: Jan Kara <firstname.lastname@example.org>
(cherry picked from commit 410dd3cf4c9b36f27ed4542ee18b1af5e68645a4)
Signed-off-by: Willy Tarreau <email@example.com>
Signed-off-by: Stefan Bader <firstname.lastname@example.org>
3 files changed