Zero out buffers used to read source files.

3 files changed, 6 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index f4b1c777..a48d4cf6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,10 @@
 2019-06-21         Arnold D. Robbins     <arnold@skeeve.com>
 
 	* config.guess, config.sub: Updated from GNULIB.
+	* awkgram.y (get_src_buf): Set buffers to zero to avoid
+	possible issues with accessing uninitialized memory.
+	Thanks to valgrind, as pointed out by Nadezhda Vyukova
+	<qniva@yandex.ru>.
 
 2019-06-19         Arnold D. Robbins     <arnold@skeeve.com>
 
diff --git a/awkgram.c b/awkgram.c
index 68cee61a..061d2975 100644
--- a/awkgram.c
+++ b/awkgram.c
@@ -5682,6 +5682,7 @@ get_src_buf()
 		sourcefile->bufsize = l;
 		newfile = true;
 		emalloc(sourcefile->buf, char *, sourcefile->bufsize, "get_src_buf");
+		memset(sourcefile->buf, '\0', sourcefile->bufsize);	// keep valgrind happy
 		lexptr = lexptr_begin = lexeme = sourcefile->buf;
 		savelen = 0;
 		sourceline = 1;
diff --git a/awkgram.y b/awkgram.y
index 3cbcfd31..a940ac9d 100644
--- a/awkgram.y
+++ b/awkgram.y
@@ -3185,6 +3185,7 @@ get_src_buf()
 		sourcefile->bufsize = l;
 		newfile = true;
 		emalloc(sourcefile->buf, char *, sourcefile->bufsize, "get_src_buf");
+		memset(sourcefile->buf, '\0', sourcefile->bufsize);	// keep valgrind happy
 		lexptr = lexptr_begin = lexeme = sourcefile->buf;
 		savelen = 0;
 		sourceline = 1;