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-rw-r--r--netwerk/base/nsFileStreams.cpp7
1 files changed, 7 insertions, 0 deletions
diff --git a/netwerk/base/nsFileStreams.cpp b/netwerk/base/nsFileStreams.cpp
index 8b719df20..1946fc7f5 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);