fix: Correct access out of bonds for buffer used for flash functions

This commit fixes issue with flash functions when using gcc >= 11
epics-modules · Jul 30, 2024 · 3c4b5fb · 3c4b5fb
1 parent 5b0c1a1
commit 3c4b5fb
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/mrfCommon/src/flash.cpp b/mrfCommon/src/flash.cpp
@@ -371,14 +371,16 @@ void CFIFlash::busyWait(double timeout, unsigned n)
 CFIStreamBuf::CFIStreamBuf(CFIFlash& flash)
     :flash(flash)
     ,pos(0u)
-{}
+{
+    buf.resize(1);
+}
 
 CFIStreamBuf::int_type CFIStreamBuf::underflow()
 {
     // read-ahead is only one page
     buf.resize(flash.pageSize());
     flash.read(pos, buf.size(), (epicsUInt8*)&buf[0]);
-    setg(&buf[0], &buf[0], &buf[buf.size()]);
+    setg(&buf[0], &buf[0], &buf[buf.size()-1]);
     pos += buf.size();
 
     return buf[0];