DHM: Fix dhm_check_range() always returning 0
Although the variable ret was initialised to an error, the
MBEDTLS_MPI_CHK macro was overwriting it. Therefore it ended up being
0 whenewer the bignum computation was successfull and stayed 0
independently of the actual check.
diff --git a/ChangeLog b/ChangeLog
index a3171d7..15e6214 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
mbed TLS ChangeLog (Sorted per branch, date)
+= mbed TLS 1.3.x branch released xxxx-xx-xx
+
+Security
+ * Fix dhm_check_range() failing to detect trivial subgroups and potentially
+ leaking 1 bit of the private key. Reported by prashantkspatil.
+
= mbed TLS 1.3.21 branch released 2017-08-10
Security