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crypto: dh - Check mpi_rshift errors

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Now that mpi_rshift can return errors, check them.

Fixes: 35d2bf2068 ("crypto: dh - calculate Q from P for the full public key verification")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2024-08-10 14:20:59 +08:00
parent 8e3a67f2de
commit 560efa7fca
1 changed files with 2 additions and 2 deletions
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4
crypto/dh.c
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@ -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 * ->p is odd, so no need to explicitly subtract one
* from it before shifting to the right. * 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); mpi_free(q);
if (ret) { if (ret) {
mpi_free(val); mpi_free(val);