[X2Go-Commits] [pale-moon] 19/22: Make nsAtomicFileOutputStream::DoOpen() fail if the file is read-only.

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x2go pushed a commit to branch upstream/palemoon-master
in repository pale-moon.

commit 9ced226336e2ef5c88be3179519d19fcdf8b0aee
Author: Pale Moon <git-repo at palemoon.org>
Date:   Tue Jul 10 17:51:04 2018 +0200

    Make nsAtomicFileOutputStream::DoOpen() fail if the file is read-only.
    
    This means we don't leave behind prefs-<n>.js files when prefs.js is read-only.
---
 netwerk/base/nsFileStreams.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/netwerk/base/nsFileStreams.cpp b/netwerk/base/nsFileStreams.cpp
index 8b719df..1946fc7 100644
--- a/netwerk/base/nsFileStreams.cpp
+++ b/netwerk/base/nsFileStreams.cpp
@@ -907,11 +907,18 @@ nsAtomicFileOutputStream::DoOpen()
     }
 
     if (NS_SUCCEEDED(rv) && mTargetFileExists) {
+        // Abort if |file| is not writable; it won't work as an output stream.
+        bool isWritable;
+        if (NS_SUCCEEDED(file->IsWritable(&isWritable)) && !isWritable) {
+            return NS_ERROR_FILE_ACCESS_DENIED;
+        }
+
         uint32_t origPerm;
         if (NS_FAILED(file->GetPermissions(&origPerm))) {
             NS_ERROR("Can't get permissions of target file");
             origPerm = mOpenParams.perm;
         }
+
         // XXX What if |perm| is more restrictive then |origPerm|?
         // This leaves the user supplied permissions as they were.
         rv = tempResult->CreateUnique(nsIFile::NORMAL_FILE_TYPE, origPerm);

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