[dm-devel] [PATCH v2 1/7] kpartx: don't keep creating recursive partitions

[Benjamin Marzinski]

If the dos partition table is corrupted, kpartx can just keep creating
the same partitions until it runs out of partition numbers. This check
catches the recursion.

Signed-off-by: Cedric Buissart <cbuissar at redhat.com>
Signed-off-by: Benjamin Marzinski <bmarzins at redhat.com>
---
 kpartx/dos.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kpartx/dos.c b/kpartx/dos.c
index 64b27b6..4985152 100644
--- a/kpartx/dos.c
+++ b/kpartx/dos.c
@@ -46,7 +46,7 @@ read_extended_partition(int fd, struct partition *ep, int en,
 		for (i=0; i<2; i++) {
 			memcpy(&p, bp + 0x1be + i * sizeof (p), sizeof (p));
 			if (is_extended(p.sys_type)) {
-				if (p.nr_sects && !moretodo) {
+				if (p.start_sect && p.nr_sects && !moretodo) {
 					next = start + sector_size_mul * le32_to_cpu(p.start_sect);
 					moretodo = 1;
 				}
-- 
1.8.3.1