Arithmetic with void pointers, e.g. a - b where both a and b are void
pointers, is undefined in the C standard. Since we are operating with
byte data here, we switch the void pointers to uint8_t pointers, and add
the necessary casts.
Signed-off-by: Mario Six <mario....@gdsys.cc>
---
Changes in v2:
None
---
tools/kwbimage.c | 22 ++++++++++++----------
1 file changed, 12 insertions(+), 10 deletions(-)
diff --git a/tools/kwbimage.c b/tools/kwbimage.c
index 0e7c96a..edc5d34 100644
--- a/tools/kwbimage.c
+++ b/tools/kwbimage.c
@@ -231,7 +231,7 @@ static void *image_create_v0(size_t *imagesz, struct
image_tool_params *params,
size_t headersz;
struct main_hdr_v0 *main_hdr;
struct ext_hdr_v0 *ext_hdr;
- void *image;
+ uint8_t *image;
int has_ext = 0;
/*
@@ -258,7 +258,7 @@ static void *image_create_v0(size_t *imagesz, struct
image_tool_params *params,
memset(image, 0, headersz);
- main_hdr = image;
+ main_hdr = (struct main_hdr_v0 *)image;
/* Fill in the main header */
main_hdr->blocksize =
@@ -284,7 +284,8 @@ static void *image_create_v0(size_t *imagesz, struct
image_tool_params *params,
if (has_ext) {
int cfgi, datai;
- ext_hdr = image + sizeof(struct main_hdr_v0);
+ ext_hdr = (struct ext_hdr_v0 *)
+ (image + sizeof(struct main_hdr_v0));
ext_hdr->offset = cpu_to_le32(0x40);
for (cfgi = 0, datai = 0; cfgi < cfgn; cfgi++) {
@@ -385,7 +386,7 @@ static void *image_create_v1(size_t *imagesz, struct
image_tool_params *params,
struct image_cfg_element *e, *binarye;
struct main_hdr_v1 *main_hdr;
size_t headersz;
- void *image, *cur;
+ uint8_t *image, *cur;
int hasext = 0;
int ret;
@@ -405,8 +406,8 @@ static void *image_create_v1(size_t *imagesz, struct
image_tool_params *params,
memset(image, 0, headersz);
- cur = main_hdr = image;
- cur += sizeof(struct main_hdr_v1);
+ main_hdr = (struct main_hdr_v1 *)image;
+ cur = image + sizeof(struct main_hdr_v1);
/* Fill the main header */
main_hdr->blocksize =
@@ -437,7 +438,7 @@ static void *image_create_v1(size_t *imagesz, struct
image_tool_params *params,
binarye = image_find_option(IMAGE_CFG_BINARY);
if (binarye) {
- struct opt_hdr_v1 *hdr = cur;
+ struct opt_hdr_v1 *hdr = (struct opt_hdr_v1 *)cur;
uint32_t *args;
size_t binhdrsz;
struct stat s;
@@ -470,7 +471,7 @@ static void *image_create_v1(size_t *imagesz, struct
image_tool_params *params,
cur += sizeof(struct opt_hdr_v1);
- args = cur;
+ args = (uint32_t *)cur;
*args = cpu_to_le32(binarye->binary.nargs);
args++;
for (argi = 0; argi < binarye->binary.nargs; argi++)
@@ -820,7 +821,7 @@ static int kwbimage_verify_header(unsigned char *ptr, int
image_size,
struct ext_hdr_v0 *ext_hdr;
uint8_t checksum;
- main_hdr = (void *)ptr;
+ main_hdr = (struct main_hdr_v0 *)ptr;
checksum = image_checksum8(ptr,
sizeof(struct main_hdr_v0)
- sizeof(uint8_t));
@@ -829,7 +830,8 @@ static int kwbimage_verify_header(unsigned char *ptr, int
image_size,
/* Only version 0 extended header has checksum */
if (image_version((void *)ptr) == 0) {
- ext_hdr = (void *)ptr + sizeof(struct main_hdr_v0);
+ ext_hdr = (struct ext_hdr_v0 *)
+ (ptr + sizeof(struct main_hdr_v0));
checksum = image_checksum8(ext_hdr,
sizeof(struct ext_hdr_v0)
- sizeof(uint8_t));
--
2.9.0
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