md/raid10: fix divide-by-zero in setup_geo() with zero far_copies

commit 9aa6d86 upstream.

setup_geo() extracts near_copies (nc) and far_copies (fc) from the
user-provided layout parameter without checking for zero. When fc=0
with the "improved" far set layout selected, 'geo->far_set_size =
disks / fc' triggers a divide-by-zero.

Validate nc and fc immediately after extraction, returning -1 if
either is zero.

Fixes: 475901a ("MD RAID10: Improve redundancy for 'far' and 'offset' algorithms (part 1)")
Cc: stable@vger.kernel.org
Signed-off-by: Junrui Luo <moonafterrain@outlook.com>
Link: https://lore.kernel.org/linux-raid/SYBPR01MB7881A5E2556806CC1D318582AF232@SYBPR01MB7881.ausprd01.prod.outlook.com
Signed-off-by: Yu Kuai <yukuai@fnnas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: avasummer

drivers/md/raid10.c

@@ -3856,6 +3856,8 @@ static int setup_geo(struct geom *geo, struct mddev *mddev, enum geo_type new)
 	nc = layout & 255;
 	fc = (layout >> 8) & 255;
 	fo = layout & (1<<16);
+	if (!nc || !fc)
+		return -1;
 	geo->raid_disks = disks;
 	geo->near_copies = nc;
 	geo->far_copies = fc;