From: Sun Yuechi <sunyuechi@iscas.ac.cn>
Date: Tue, 30 Jun 2026 06:44:56 +0000 (+0800)
Subject: rgw/posix: fix inverted If-None-Match check allowing overwrite
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=93febadb4fae16d9313830c3e8e311c7c18187e8;p=ceph.git

rgw/posix: fix inverted If-None-Match check allowing overwrite

If-None-Match: * must fail when the object exists, but the posix writer
did the opposite, disabling overwrite protection. Return
PRECONDITION_FAILED when the object exists.

Fixes: https://tracker.ceph.com/issues/77871
Signed-off-by: Sun Yuechi <sunyuechi@iscas.ac.cn>
---

diff --git a/src/rgw/driver/posix/rgw_sal_posix.cc b/src/rgw/driver/posix/rgw_sal_posix.cc
index 92710d016691..ab3310f9596a 100644
--- a/src/rgw/driver/posix/rgw_sal_posix.cc
+++ b/src/rgw/driver/posix/rgw_sal_posix.cc
@@ -4577,7 +4577,7 @@ int POSIXAtomicWriter::complete(size_t accounted_size, const std::string& etag,
   if (if_nomatch) {
     if (strcmp(if_nomatch, "*") == 0) {
       // test the object is not existing
-      if (!exists) {
+      if (exists) {
 	return -ERR_PRECONDITION_FAILED;
       }
     } else {