efi_loader: Change ptr arithmetics tcg eventlog buffer

Although ptr arithmetics are allowed with extensions in gcc, they
are not allowed by the C spec. So switch to (void *)(uintptr_t) instead

Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>

diff --git a/lib/efi_loader/efi_tcg2.c b/lib/efi_loader/efi_tcg2.c
index 0904684..ed86a22 100644 (file)
--- a/lib/efi_loader/efi_tcg2.c
+++ b/lib/efi_loader/efi_tcg2.c
@@ -176,13 +176,14 @@ static efi_status_t tcg2_agile_log_append(u32 pcr_index, u32 event_type,
                                          struct tpml_digest_values *digest_list,
                                          u32 size, u8 event[])
 {
-       void *log = event_log.buffer + event_log.pos;
+       void *log = (void *)((uintptr_t)event_log.buffer + event_log.pos);
        size_t pos;
        int i;
        u32 event_size;
 
        if (event_log.get_event_called)
-               log = event_log.final_buffer + event_log.final_pos;
+               log = (void *)((uintptr_t)event_log.final_buffer +
+                              event_log.final_pos);
 
        /*
         * size refers to the length of event[] only, we need to check against
@@ -197,24 +198,24 @@ static efi_status_t tcg2_agile_log_append(u32 pcr_index, u32 event_type,
 
        put_unaligned_le32(pcr_index, log);
        pos = offsetof(struct tcg_pcr_event2, event_type);
-       put_unaligned_le32(event_type, log + pos);
+       put_unaligned_le32(event_type, (void *)((uintptr_t)log + pos));
        pos = offsetof(struct tcg_pcr_event2, digests); /* count */
-       put_unaligned_le32(digest_list->count, log + pos);
+       put_unaligned_le32(digest_list->count, (void *)((uintptr_t)log + pos));
 
        pos += offsetof(struct tpml_digest_values, digests);
        for (i = 0; i < digest_list->count; i++) {
                u16 hash_alg = digest_list->digests[i].hash_alg;
                u8 *digest = (u8 *)&digest_list->digests[i].digest;
 
-               put_unaligned_le16(hash_alg, log + pos);
+               put_unaligned_le16(hash_alg, (void *)((uintptr_t)log + pos));
                pos += offsetof(struct tpmt_ha, digest);
-               memcpy(log + pos, digest, alg_to_len(hash_alg));
+               memcpy((void *)((uintptr_t)log + pos), digest, alg_to_len(hash_alg));
                pos += alg_to_len(hash_alg);
        }
 
-       put_unaligned_le32(size, log + pos);
+       put_unaligned_le32(size, (void *)((uintptr_t)log + pos));
        pos += sizeof(u32); /* tcg_pcr_event2 event_size*/
-       memcpy(log + pos, event, size);
+       memcpy((void *)((uintptr_t)log + pos), event, size);
        pos += size;
 
        /* make sure the calculated buffer is what we checked against */
@@ -1046,7 +1047,7 @@ static efi_status_t efi_init_event_log(void)
        put_unaligned_le32(0, &event_header->pcr_index);
        put_unaligned_le32(EV_NO_ACTION, &event_header->event_type);
        memset(&event_header->digest, 0, sizeof(event_header->digest));
-       ret = create_specid_event(dev, event_log.buffer + sizeof(*event_header),
+       ret = create_specid_event(dev, (void *)((uintptr_t)event_log.buffer + sizeof(*event_header)),
                                  &spec_event_size);
        if (ret != EFI_SUCCESS)
                goto out;