Similar to commit<70de2cbda8a5>("dm thin: add sanity checks
to thin-pool and external snapshot creation"),there should be a check
for argc and argv to prevent Null pointer dereferencing when the dm_get_device
invoked twice on the same device path with differnt mode.
Signed-off-by: Defang Bo <bodefang@xxxxxxx>
---
drivers/md/dm-snap.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 4668b2c..dccce8b 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -1258,6 +1258,13 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
as.argc = argc;
as.argv = argv;
+
+ if (!strcmp(argv[0], argv[1])) {
+ ti->error = "Error setting metadata or data device";
+ r = -EINVAL;
+ goto bad;
+ }
+
dm_consume_args(&as, 4);
r = parse_snapshot_features(&as, s, ti);
if (r)
--
2.7.4
--
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