imgdiff: don't fail if gzip is corrupted.
Treat it as a normal chunk if inflate() fails.
Test: run imgdiff on corrupted gzip and apply the patch
Bug: 27153028
Change-Id: Idcbb3c1360ec0774e6c7861b21d99af8ee10604a
diff --git a/applypatch/imgdiff.cpp b/applypatch/imgdiff.cpp
index a3c10b4..2aa4a68 100644
--- a/applypatch/imgdiff.cpp
+++ b/applypatch/imgdiff.cpp
@@ -407,7 +407,6 @@
while (pos < sz) {
unsigned char* p = img+pos;
- bool processed_deflate = false;
if (sz - pos >= 4 &&
p[0] == 0x1f && p[1] == 0x8b &&
p[2] == 0x08 && // deflate compression
@@ -461,28 +460,27 @@
strm.next_out = curr->data + curr->len;
ret = inflate(&strm, Z_NO_FLUSH);
if (ret < 0) {
- if (!processed_deflate) {
- // This is the first chunk, assume that it's just a spurious
- // gzip header instead of a real one.
- break;
- }
- printf("Error: inflate failed [%s] at file offset [%zu]\n"
- "imgdiff only supports gzip kernel compression,"
- " did you try CONFIG_KERNEL_LZO?\n",
+ printf("Warning: inflate failed [%s] at offset [%zu],"
+ " treating as a normal chunk\n",
strm.msg, chunk_offset);
- free(img);
- return NULL;
+ break;
}
curr->len = allocated - strm.avail_out;
if (strm.avail_out == 0) {
allocated *= 2;
curr->data = reinterpret_cast<unsigned char*>(realloc(curr->data, allocated));
}
- processed_deflate = true;
} while (ret != Z_STREAM_END);
curr->deflate_len = sz - strm.avail_in - pos;
inflateEnd(&strm);
+
+ if (ret < 0) {
+ free(curr->data);
+ *num_chunks -= 2;
+ continue;
+ }
+
pos += curr->deflate_len;
p += curr->deflate_len;
++curr;
