在 7/7/2025 6:39 PM, Mikulas Patocka 写道:
There's a possible integer overflow in stripe_io_hints if we have too
large chunk size. Test if the overflow happened, and if it did, don't set
limits->io_min and limits->io_opt;
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
drivers/md/dm-stripe.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
Index: linux-2.6/drivers/md/dm-stripe.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-stripe.c 2025-07-06 15:02:23.000000000 +0200
+++ linux-2.6/drivers/md/dm-stripe.c 2025-07-07 12:32:49.000000000 +0200
@@ -456,10 +456,14 @@ static void stripe_io_hints(struct dm_ta
struct queue_limits *limits)
{
struct stripe_c *sc = ti->private;
- unsigned int chunk_size = sc->chunk_size << SECTOR_SHIFT;
+ unsigned int io_min = sc->chunk_size << SECTOR_SHIFT;
+ unsigned int io_opt = io_min * sc->stripes;
- limits->io_min = chunk_size;
- limits->io_opt = chunk_size * sc->stripes;
+ if (io_min >> SECTOR_SHIFT == sc->chunk_size &&
+ io_opt / sc->stripes == io_min) {
+ limits->io_min = io_min;
+ limits->io_opt = io_opt;
+ }
Hi Mikulas,
What about using check_xxx_overflow() ? something like:
if (check_shl_overflow(sc->chunk_size, SECTOR_SHIFT, &io_min))
return;
if (check_mul_overflow(io_min, sc->stripes, &io_opt))
return;
limits->io_min = io_min;
limits->io_opt = io_opt;
}
static struct target_type stripe_target = {
