[dm-devel] Missing chunk size constraint in dm-stripe

[Alasdair G Kergon <agk redhat com>]

Ensure number of stripe chunks fits into 32 bits.
--- diff/drivers/md/dm-stripe.c	2005-01-21 15:10:13.000000000 +0000
+++ source/drivers/md/dm-stripe.c	2005-01-21 15:09:47.000000000 +0000
@@ -135,6 +135,11 @@
 		chunk_size >>= 1;
 	sc->chunk_shift--;
 
+	if ((sizeof(ti->len) > 4) && (ti->len >> 32 >> sc->chunk_shift)) {
+		ti->error = "dm-stripe: Chunk size too small for stripe";
+		return -EINVAL;
+	}
+
 	/*
 	 * Get the stripe destinations.
 	 */