ifwitool: Fix member access

On a second and third look, a recent patch seems to be writing to the
wrong place - updating offsets from the address of the pointer instead
of what the pointer points to.

Fix it.

Signed-off-by: Simon Glass <sjg@chromium.org>
Fixes: 2d1b2ac13fe ("tool: ifwitool: Fix buffer overflow")
Acked-by: Sean Anderson <seanga2@gmail.com>

diff --git a/tools/ifwitool.c b/tools/ifwitool.c
index 3159186..c1defe5 100644 (file)
--- a/tools/ifwitool.c
+++ b/tools/ifwitool.c
@@ -721,7 +721,7 @@ static size_t read_member(void *src, size_t offset, size_t size_bytes,
  */
 static size_t fix_member(void *data, size_t offset, size_t size_bytes)
 {
-       uint8_t *src = (uint8_t *)data + offset;
+       void *src = (uint8_t *)data + offset;
 
        switch (size_bytes) {
        case 1:
@@ -1441,20 +1441,20 @@ static void bpdt_fixup_write_buffer(struct buffer *buf)
 
        size_t offset = 0;
 
-       offset = fix_member(&s, offset, sizeof(h->signature));
-       offset = fix_member(&s, offset, sizeof(h->descriptor_count));
-       offset = fix_member(&s, offset, sizeof(h->bpdt_version));
-       offset = fix_member(&s, offset, sizeof(h->xor_redundant_block));
-       offset = fix_member(&s, offset, sizeof(h->ifwi_version));
-       offset = fix_member(&s, offset, sizeof(h->fit_tool_version));
+       offset = fix_member(s, offset, sizeof(h->signature));
+       offset = fix_member(s, offset, sizeof(h->descriptor_count));
+       offset = fix_member(s, offset, sizeof(h->bpdt_version));
+       offset = fix_member(s, offset, sizeof(h->xor_redundant_block));
+       offset = fix_member(s, offset, sizeof(h->ifwi_version));
+       offset = fix_member(s, offset, sizeof(h->fit_tool_version));
 
        uint32_t i;
 
        for (i = 0; i < count; i++) {
-               offset = fix_member(&s, offset, sizeof(e[i].type));
-               offset = fix_member(&s, offset, sizeof(e[i].flags));
-               offset = fix_member(&s, offset, sizeof(e[i].offset));
-               offset = fix_member(&s, offset, sizeof(e[i].size));
+               offset = fix_member(s, offset, sizeof(e[i].type));
+               offset = fix_member(s, offset, sizeof(e[i].flags));
+               offset = fix_member(s, offset, sizeof(e[i].offset));
+               offset = fix_member(s, offset, sizeof(e[i].size));
        }
 }
 
@@ -1654,21 +1654,21 @@ static void subpart_dir_fixup_write_buffer(struct buffer *buf)
        size_t count = h->num_entries;
        size_t offset = 0;
 
-       offset = fix_member(&s, offset, sizeof(h->marker));
-       offset = fix_member(&s, offset, sizeof(h->num_entries));
-       offset = fix_member(&s, offset, sizeof(h->header_version));
-       offset = fix_member(&s, offset, sizeof(h->entry_version));
-       offset = fix_member(&s, offset, sizeof(h->header_length));
-       offset = fix_member(&s, offset, sizeof(h->checksum));
+       offset = fix_member(s, offset, sizeof(h->marker));
+       offset = fix_member(s, offset, sizeof(h->num_entries));
+       offset = fix_member(s, offset, sizeof(h->header_version));
+       offset = fix_member(s, offset, sizeof(h->entry_version));
+       offset = fix_member(s, offset, sizeof(h->header_length));
+       offset = fix_member(s, offset, sizeof(h->checksum));
        offset += sizeof(h->name);
 
        uint32_t i;
 
        for (i = 0; i < count; i++) {
                offset += sizeof(e[i].name);
-               offset = fix_member(&s, offset, sizeof(e[i].offset));
-               offset = fix_member(&s, offset, sizeof(e[i].length));
-               offset = fix_member(&s, offset, sizeof(e[i].rsvd));
+               offset = fix_member(s, offset, sizeof(e[i].offset));
+               offset = fix_member(s, offset, sizeof(e[i].length));
+               offset = fix_member(s, offset, sizeof(e[i].rsvd));
        }
 }