Fix potential buffer overrun.android-cts-5.1_r28android-cts-5.1_r27android-cts-5.1_r26android-cts-5.1_r25android-cts-5.1_r24android-cts-5.1_r23android-cts-5.1_r22android-cts-5.1_r21android-cts-5.1_r20android-cts-5.1_r19android-cts-5.1_r18android-cts-5.1_r17android-cts-5.1_r16android-cts-5.1_r15android-cts-5.1_r14android-cts-5.1_r13android-5.1.1_r38lollipop-mr1-releaselollipop-mr1-cts-release

BUG=27840771

Change-Id: I240f188b2e8f4b45d90138cfb3b14869cf506452

1 files changed, 5 insertions, 5 deletions

diff --git a/libdex/OptInvocation.cpp b/libdex/OptInvocation.cpp
index 031ec9177..a9ea3a2d5 100644
--- a/libdex/OptInvocation.cpp
+++ b/libdex/OptInvocation.cpp
@@ -89,9 +89,9 @@ char* dexOptGenerateCacheFileName(const char* fileName, const char* subFileName)
             ALOGE("Can't get CWD while opening jar file");
             return NULL;
         }
-        strncat(absoluteFile, "/", kBufLen);
+        strncat(absoluteFile, "/", kBufLen - strlen(absoluteFile));
     }
-    strncat(absoluteFile, fileName, kBufLen);
+    strncat(absoluteFile, fileName, kBufLen - strlen(absoluteFile));
 
     /*
      * Append the name of the Jar file entry, if any.  This is not currently
@@ -99,8 +99,8 @@ char* dexOptGenerateCacheFileName(const char* fileName, const char* subFileName)
      * in a Jar.
      */
     if (subFileName != NULL) {
-        strncat(absoluteFile, "/", kBufLen);
-        strncat(absoluteFile, subFileName, kBufLen);
+        strncat(absoluteFile, "/", kBufLen - strlen(absoluteFile));
+        strncat(absoluteFile, subFileName, kBufLen - strlen(absoluteFile));
     }
 
     /* Turn the path into a flat filename by replacing
@@ -138,7 +138,7 @@ char* dexOptGenerateCacheFileName(const char* fileName, const char* subFileName)
 
     /* Tack on the file name for the actual cache file path.
      */
-    strncat(nameBuf, absoluteFile, kBufLen);
+    strncat(nameBuf, absoluteFile, kBufLen - strlen(nameBuf));
 
     ALOGV("Cache file for '%s' '%s' is '%s'", fileName, subFileName, nameBuf);
     return strdup(nameBuf);