On Sun, 16 Feb 2025, Milan Broz wrote:
In Inline mode, the journal is unused, and journal_sectors is zero.
Calculating the journal watermark requires dividing by journal_sectors, which should be done only if the journal is configured.
Otherwise, a simple table query (dmsetup table) can cause OOPS.
This bug did not show on some systems, perhaps only due to compiler optimization.
On my 32-bit testing machine, this reliably crashes with the following:
: Oops: divide error: 0000 [#1] PREEMPT SMP : CPU: 0 UID: 0 PID: 2450 Comm: dmsetup Not tainted 6.14.0-rc2+ #959 : EIP: dm_integrity_status+0x2f8/0xab0 [dm_integrity] ...
Signed-off-by: Milan Broz gmazyland@gmail.com Fixes: fb0987682c62 ("dm-integrity: introduce the Inline mode") Cc: stable@vger.kernel.org # 6.11+
Both patches applied, thanks.
Mikulas