From 3dc14cb429061e49ef76948cf55a0e3edf8b170a Mon Sep 17 00:00:00 2001
From: Tao Bao <tbao@google.com>
Date: Tue, 22 Nov 2016 11:37:13 -0800
Subject: Add ota_close(unique_fd&) and ota_fclose(std::unique_ptr<FILE>&).

We were using the below sequence prior to the CL in [1].

unique_fd fd(ota_open(...));
ota_close(fd);
fd.reset(ota_open(...));

fd.reset() may unintentionally close the newly opened FD if it
has the same value as the early ota_open. The CL in [1] changed to
"ota_close(fd.release())" to avoid the issue. This CL adds a new
overloaded function ota_close(unique_fd&) to handle the release
automatically.

Similarly add ota_fclose(std::unique_ptr<FILE>&).

[1] commit 48cf770471ef53fbf0a1837196220862a0bdb18d.

Bug: 33034669
Test: recovery_component_test passes.
Change-Id: Ief91edc590e95a7426e33364b28754173efb1056
---
 applypatch/applypatch.cpp | 14 +++++++-------
 otafault/ota_io.cpp       | 14 ++++++++++++--
 otafault/ota_io.h         |  6 ++++++
 3 files changed, 25 insertions(+), 9 deletions(-)

diff --git a/applypatch/applypatch.cpp b/applypatch/applypatch.cpp
index 41a8d582b..0250407a5 100644
--- a/applypatch/applypatch.cpp
+++ b/applypatch/applypatch.cpp
@@ -66,7 +66,7 @@ int LoadFileContents(const char* filename, FileContents* file) {
   }
 
   std::vector<unsigned char> data(file->st.st_size);
-  std::unique_ptr<FILE, decltype(&ota_fclose)> f(ota_fopen(filename, "rb"), ota_fclose);
+  std::unique_ptr<FILE, int (*)(FILE*)> f(ota_fopen(filename, "rb"), ota_fclose);
   if (!f) {
     printf("failed to open \"%s\": %s\n", filename, strerror(errno));
     return -1;
@@ -118,7 +118,7 @@ static int LoadPartitionContents(const std::string& filename, FileContents* file
   std::sort(pairs.begin(), pairs.end());
 
   const char* partition = pieces[1].c_str();
-  std::unique_ptr<FILE, decltype(&ota_fclose)> dev(ota_fopen(partition, "rb"), ota_fclose);
+  std::unique_ptr<FILE, int (*)(FILE*)> dev(ota_fopen(partition, "rb"), ota_fclose);
   if (!dev) {
     printf("failed to open emmc partition \"%s\": %s\n", partition, strerror(errno));
     return -1;
@@ -210,7 +210,7 @@ int SaveFileContents(const char* filename, const FileContents* file) {
     printf("fsync of \"%s\" failed: %s\n", filename, strerror(errno));
     return -1;
   }
-  if (ota_close(fd.release()) != 0) {
+  if (ota_close(fd) != 0) {
     printf("close of \"%s\" failed: %s\n", filename, strerror(errno));
     return -1;
   }
@@ -268,7 +268,7 @@ int WriteToPartition(const unsigned char* data, size_t len, const std::string& t
       printf("failed to sync to %s: %s\n", partition, strerror(errno));
       return -1;
     }
-    if (ota_close(fd.release()) != 0) {
+    if (ota_close(fd) != 0) {
       printf("failed to close %s: %s\n", partition, strerror(errno));
       return -1;
     }
@@ -287,7 +287,7 @@ int WriteToPartition(const unsigned char* data, size_t len, const std::string& t
     } else {
       printf("  caches dropped\n");
     }
-    ota_close(dc.release());
+    ota_close(dc);
     sleep(1);
 
     // Verify.
@@ -339,7 +339,7 @@ int WriteToPartition(const unsigned char* data, size_t len, const std::string& t
     return -1;
   }
 
-  if (ota_close(fd.release()) == -1) {
+  if (ota_close(fd) == -1) {
     printf("error closing %s: %s\n", partition, strerror(errno));
     return -1;
   }
@@ -782,7 +782,7 @@ static int GenerateTarget(FileContents* source_file,
         printf("failed to fsync file \"%s\": %s\n", tmp_target_filename.c_str(), strerror(errno));
         result = 1;
       }
-      if (ota_close(output_fd.release()) != 0) {
+      if (ota_close(output_fd) != 0) {
         printf("failed to close file \"%s\": %s\n", tmp_target_filename.c_str(), strerror(errno));
         result = 1;
       }
diff --git a/otafault/ota_io.cpp b/otafault/ota_io.cpp
index 2efd3004a..874cb1d5c 100644
--- a/otafault/ota_io.cpp
+++ b/otafault/ota_io.cpp
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-#include <map>
+#include "ota_io.h"
 
 #include <errno.h>
 #include <fcntl.h>
@@ -22,8 +22,10 @@
 #include <sys/stat.h>
 #include <unistd.h>
 
+#include <map>
+#include <memory>
+
 #include "config.h"
-#include "ota_io.h"
 
 static std::map<intptr_t, const char*> filename_cache;
 static std::string read_fault_file_name = "";
@@ -74,11 +76,19 @@ int ota_close(int fd) {
     return close(fd);
 }
 
+int ota_close(unique_fd& fd) {
+    return ota_close(fd.release());
+}
+
 int ota_fclose(FILE* fh) {
     filename_cache.erase((intptr_t)fh);
     return fclose(fh);
 }
 
+int ota_fclose(std::unique_ptr<FILE, int (*)(FILE*)>& fh) {
+    return ota_fclose(fh.release());
+}
+
 size_t ota_fread(void* ptr, size_t size, size_t nitems, FILE* stream) {
     if (should_fault_inject(OTAIO_READ)) {
         auto cached = filename_cache.find((intptr_t)stream);
diff --git a/otafault/ota_io.h b/otafault/ota_io.h
index e119eef08..45d17b1bb 100644
--- a/otafault/ota_io.h
+++ b/otafault/ota_io.h
@@ -26,6 +26,8 @@
 #include <stdio.h>
 #include <sys/stat.h>
 
+#include <memory>
+
 #include <android-base/unique_fd.h>
 
 #define OTAIO_CACHE_FNAME "/cache/saved.file"
@@ -60,4 +62,8 @@ struct OtaCloser {
 
 using unique_fd = android::base::unique_fd_impl<OtaCloser>;
 
+int ota_close(unique_fd& fd);
+
+int ota_fclose(std::unique_ptr<FILE, int (*)(FILE*)>& fh);
+
 #endif
-- 
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