tpm: fix unsigned/signed mismatch errors related to __calc_tpm2_event_size

__calc_tpm2_event_size returns 0 or a positive length, but return values
are often interpreted as ints.  Convert everything over to u32 to avoid
signed/unsigned logic errors.

Signed-off-by: Gregory Price <gourry@gourry.net>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

diff --git a/drivers/firmware/efi/libstub/tpm.c b/drivers/firmware/efi/libstub/tpm.c
index 1fd6823..d31ea3f 100644 (file)
--- a/drivers/firmware/efi/libstub/tpm.c
+++ b/drivers/firmware/efi/libstub/tpm.c
@@ -57,7 +57,7 @@ static void efi_retrieve_tcg2_eventlog(int version, efi_physical_addr_t log_loca
        struct linux_efi_tpm_eventlog *log_tbl = NULL;
        unsigned long first_entry_addr, last_entry_addr;
        size_t log_size, last_entry_size;
-       int final_events_size = 0;
+       u32 final_events_size = 0;
 
        first_entry_addr = (unsigned long) log_location;
 
@@ -110,9 +110,9 @@ static void efi_retrieve_tcg2_eventlog(int version, efi_physical_addr_t log_loca
         */
        if (final_events_table && final_events_table->nr_events) {
                struct tcg_pcr_event2_head *header;
-               int offset;
+               u32 offset;
                void *data;
-               int event_size;
+               u32 event_size;
                int i = final_events_table->nr_events;
 
                data = (void *)final_events_table;

diff --git a/drivers/firmware/efi/tpm.c b/drivers/firmware/efi/tpm.c
index b0cc2cc..cdd4310 100644 (file)
--- a/drivers/firmware/efi/tpm.c
+++ b/drivers/firmware/efi/tpm.c
@@ -19,7 +19,7 @@ EXPORT_SYMBOL(efi_tpm_final_log_size);
 static int __init tpm2_calc_event_log_size(void *data, int count, void *size_info)
 {
        struct tcg_pcr_event2_head *header;
-       int event_size, size = 0;
+       u32 event_size, size = 0;
 
        while (count > 0) {
                header = data + size;

diff --git a/include/linux/tpm_eventlog.h b/include/linux/tpm_eventlog.h
index 7d68a5c..891368e 100644 (file)
--- a/include/linux/tpm_eventlog.h
+++ b/include/linux/tpm_eventlog.h
@@ -157,7 +157,7 @@ struct tcg_algorithm_info {
  * Return: size of the event on success, 0 on failure
  */
 
-static __always_inline int __calc_tpm2_event_size(struct tcg_pcr_event2_head *event,
+static __always_inline u32 __calc_tpm2_event_size(struct tcg_pcr_event2_head *event,
                                         struct tcg_pcr_event *event_header,
                                         bool do_mapping)
 {