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Use MAX_FDT_GROWTH instead of hardcode value

This commit is contained in:
topjohnwu 2020-02-01 00:58:33 +08:00
parent 5c988510b3
commit 5b56ca7ffc
1 changed files with 7 additions and 5 deletions
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12
native/jni/magiskboot/dtb.cpp
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@ -191,6 +191,8 @@ static bool fdt_patch(Iter first, Iter last) {
return modified;
}
#define MAX_FDT_GROWTH 256
template <class Table, class Header>
static int dt_table_patch(const Header *hdr, const char *out) {
map<uint32_t, fdt_blob> dtb_map;
@ -216,9 +218,9 @@ static int dt_table_patch(const Header *hdr, const char *out) {
if (dtb_map.count(offset) == 0) {
auto blob = buf + offset;
uint32_t size = fdt_totalsize(blob);
auto fdt = xmalloc(size + 256);
auto fdt = xmalloc(size + MAX_FDT_GROWTH);
memcpy(fdt, blob, size);
fdt_open_into(fdt, fdt, size + 256);
fdt_open_into(fdt, fdt, size + MAX_FDT_GROWTH);
dtb_map[offset] = { fdt, offset };
}
}
@ -255,7 +257,7 @@ static int dt_table_patch(const Header *hdr, const char *out) {
val.second.offset = lseek(fd, 0, SEEK_CUR);
auto fdt = val.second.fdt;
fdt_pack(fdt);
int size = fdt_totalsize(fdt);
auto size = fdt_totalsize(fdt);
total_size += xwrite(fd, fdt, size);
val.second.len = do_align(size, align);
write_zero(fd, align_off(lseek(fd, 0, SEEK_CUR), align));
@ -287,12 +289,12 @@ static int blob_patch(uint8_t *dtb, size_t dtb_sz, const char *out) {
for (int i = 0; i < dtb_sz; ++i) {
if (memcmp(dtb + i, FDT_MAGIC_STR, 4) == 0) {
auto len = fdt_totalsize(dtb + i);
auto fdt = static_cast<uint8_t *>(xmalloc(len + 256));
auto fdt = static_cast<uint8_t *>(xmalloc(len + MAX_FDT_GROWTH));
memcpy(fdt, dtb + i, len);
fdt_pack(fdt);
uint32_t padding = len - fdt_totalsize(fdt);
padding_list.push_back(padding);
fdt_open_into(fdt, fdt, len + 256);
fdt_open_into(fdt, fdt, len + MAX_FDT_GROWTH);
fdt_list.push_back(fdt);
i += len - 1;
}