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[mirror_ubuntu-artful-kernel.git] / crypto / dh_helper.c

diff --git a/crypto/dh_helper.c b/crypto/dh_helper.c
index 708ae20d2d3ccf84280d97e446d350420c828c35..7f00c771fe8d7cee3bbe3d7921fc137bab4c3d40 100644 (file)
--- a/crypto/dh_helper.c
+++ b/crypto/dh_helper.c
@@ -83,6 +83,14 @@ int crypto_dh_decode_key(const char *buf, unsigned int len, struct dh *params)
        if (secret.len != crypto_dh_key_len(params))
                return -EINVAL;
 
+       /*
+        * Don't permit the buffer for 'key' or 'g' to be larger than 'p', since
+        * some drivers assume otherwise.
+        */
+       if (params->key_size > params->p_size ||
+           params->g_size > params->p_size)
+               return -EINVAL;
+
        /* Don't allocate memory. Set pointers to data within
         * the given buffer
         */