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Merge "ANDROID: fuzz: Only check valid phandles" am: 91b7c8d942 am: ec4f0887eb

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Original change: https://android-review.googlesource.com/c/platform/external/dtc/+/2171323

Change-Id: Ia9b8d699766689c5401edbde8839dd29efdcde42
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
This commit is contained in:
Treehugger Robot 2022-09-09 17:46:53 +00:00 committed by Automerger Merge Worker
commit 2b3ff5c1b6
1 changed files with 6 additions and 2 deletions
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8
fuzzing/libfdt_fuzzer.c
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@ -55,6 +55,9 @@ static void check_mem(const void *mem, size_t len) {
#endif
}
static bool phandle_is_valid(uint32_t phandle) {
return phandle != 0 && phandle != UINT32_MAX;
}
static void walk_device_tree(const void *device_tree, int parent_node) {
int len = 0;
@ -64,8 +67,9 @@ static void walk_device_tree(const void *device_tree, int parent_node) {
}
uint32_t phandle = fdt_get_phandle(device_tree, parent_node);
if (phandle != 0) {
assert(parent_node == fdt_node_offset_by_phandle(device_tree, phandle));
if (phandle_is_valid(phandle)) {
int node = fdt_node_offset_by_phandle(device_tree, phandle);
assert(node >= 0); // it should at least find parent_node
}
// recursively walk the node's children