commit 436400eec3a772caf17b59850ac6adae2bded8fc
author Gilles Peskine <Gilles.Peskine@arm.com> Wed Nov 25 16:15:14 2020 +0100
committer Gilles Peskine <Gilles.Peskine@arm.com> Wed Nov 25 17:30:46 2020 +0100
tree 4bc6802272aa76346b87a198bfcf0329ad2168d3
parent 3cb1e296a48fce2546c13264f619d0a199660377

Handle random generator failure in mbedtls_mpi_fill_random()

Discuss the impact in a changelog entry.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>

library/bignum.c

diff --git a/library/bignum.c b/library/bignum.c
index 9325632..1f99ca7 100644
--- a/library/bignum.c
+++ b/library/bignum.c
@@ -2391,7 +2391,7 @@
     MBEDTLS_MPI_CHK( mbedtls_mpi_lset( X, 0 ) );
 
     Xp = (unsigned char*) X->p;
-    f_rng( p_rng, Xp + overhead, size );
+    MBEDTLS_MPI_CHK( f_rng( p_rng, Xp + overhead, size ) );
 
     mpi_bigendian_to_host( X->p, limbs );