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-rw-r--r--crypto/dh.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/crypto/dh.c b/crypto/dh.c
index 68d11d66c0b5..afc0fd847761 100644
--- a/crypto/dh.c
+++ b/crypto/dh.c
@@ -145,9 +145,9 @@ static int dh_is_pubkey_valid(struct dh_ctx *ctx, MPI y)
* ->p is odd, so no need to explicitly subtract one
* from it before shifting to the right.
*/
- mpi_rshift(q, ctx->p, 1);
+ ret = mpi_rshift(q, ctx->p, 1) ?:
+ mpi_powm(val, y, q, ctx->p);
- ret = mpi_powm(val, y, q, ctx->p);
mpi_free(q);
if (ret) {
mpi_free(val);