[Beignet] [PATCH] Correct the error llvm link msg copy in function genProgramLinkFromLLVM.

[Yang Rong]

Use strncpy to avoid overflow and need return errSize.

Signed-off-by: Yang Rong <rong.r.y...@intel.com>
---
 backend/src/backend/gen_program.cpp | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/backend/src/backend/gen_program.cpp 
b/backend/src/backend/gen_program.cpp
index 65a7ba2..2525825 100644
--- a/backend/src/backend/gen_program.cpp
+++ b/backend/src/backend/gen_program.cpp
@@ -394,10 +394,9 @@ namespace gbe {
       if (LLVMLinkModules(wrap(dst), wrap(src), 0, &errMsg)) {
 #endif
         if (err != NULL && errSize != NULL && stringSize > 0u) {
-          if(strlen(errMsg) < stringSize )
-            stringSize = strlen(errMsg);
-          strcpy(err, errMsg);
-          err[stringSize+1] = '\0';
+          strncpy(err, errMsg, stringSize-1);
+          err[stringSize-1] = '\0';
+          *errSize = strlen(err);
         }
       }
     }
-- 
1.8.3.2

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