From 45c7b4b51abafb394928eb29a3edf20f81b3e761 Mon Sep 17 00:00:00 2001
From: Radoslaw Zarzynski <rzarzyns@redhat.com>
Date: Tue, 8 Mar 2022 01:51:09 +0000
Subject: [PATCH] crimson/osd, osd: don't use VLA in cls_log() anymore.

Signed-off-by: Radoslaw Zarzynski <rzarzyns@redhat.com>
---
 src/crimson/osd/objclass.cc | 13 +++++++------
 src/osd/objclass.cc         | 13 +++++++------
 2 files changed, 14 insertions(+), 12 deletions(-)

diff --git a/src/crimson/osd/objclass.cc b/src/crimson/osd/objclass.cc
index c32f7eb508210..2642a60fadf0b 100644
--- a/src/crimson/osd/objclass.cc
+++ b/src/crimson/osd/objclass.cc
@@ -3,6 +3,7 @@
 
 #include <cstdarg>
 #include <cstring>
+#include <boost/container/small_vector.hpp>
 #include "common/ceph_context.h"
 #include "common/ceph_releases.h"
 #include "common/config.h"
@@ -536,16 +537,16 @@ int cls_cxx_get_gathered_data(cls_method_context_t hctx, std::map<std::string, b
 // the classical OSD, it's different b/c of how the dout macro expands.
 int cls_log(int level, const char *format, ...)
 {
-   int size = 256;
+   size_t size = 256;
    va_list ap;
    while (1) {
-     char buf[size];
+     boost::container::small_vector<char, 256> buf(size);
      va_start(ap, format);
-     int n = vsnprintf(buf, size, format, ap);
+     int n = vsnprintf(buf.data(), size, format, ap);
      va_end(ap);
-#define MAX_SIZE 8196
-     if ((n > -1 && n < size) || size > MAX_SIZE) {
-       dout(ceph::dout::need_dynamic(level)) << buf << dendl;
+#define MAX_SIZE 8196UL
+     if ((n > -1 && static_cast<size_t>(n) < size) || size > MAX_SIZE) {
+       dout(ceph::dout::need_dynamic(level)) << buf.data() << dendl;
        return n;
      }
      size *= 2;
diff --git a/src/osd/objclass.cc b/src/osd/objclass.cc
index eb20811a233b3..74bd95e9712e2 100644
--- a/src/osd/objclass.cc
+++ b/src/osd/objclass.cc
@@ -2,6 +2,7 @@
 // vim: ts=8 sw=2 smarttab
 
 #include <cstdarg>
+#include <boost/container/small_vector.hpp>
 #include "common/ceph_context.h"
 #include "common/ceph_releases.h"
 #include "common/config.h"
@@ -753,16 +754,16 @@ int cls_cxx_get_gathered_data(cls_method_context_t hctx, std::map<std::string, b
 // crimson-osd, it's different b/c of how the dout macro expands.
 int cls_log(int level, const char *format, ...)
 {
-   int size = 256;
+   size_t size = 256;
    va_list ap;
    while (1) {
-     char buf[size];
+     boost::container::small_vector<char, 256> buf(size);
      va_start(ap, format);
-     int n = vsnprintf(buf, size, format, ap);
+     int n = vsnprintf(buf.data(), size, format, ap);
      va_end(ap);
-#define MAX_SIZE 8196
-     if ((n > -1 && n < size) || size > MAX_SIZE) {
-       dout(ceph::dout::need_dynamic(level)) << buf << dendl;
+#define MAX_SIZE 8196UL
+     if ((n > -1 && static_cast<size_t>(n) < size) || size > MAX_SIZE) {
+       dout(ceph::dout::need_dynamic(level)) << buf.data() << dendl;
        return n;
      }
      size *= 2;
-- 
2.39.5