janhoy commented on a change in pull request #593:
URL: https://github.com/apache/solr/pull/593#discussion_r798946218
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File path: solr/core/src/java/org/apache/solr/filestore/DistribPackageStore.java
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@@ -94,8 +94,18 @@ private static Path _getRealPath(String path, Path solrHome)
{
if (!path.isEmpty() && path.charAt(0) != File.separatorChar) {
path = File.separator + path;
}
- // Use concat because path might start with a slash and be incorrectly
interpreted as absolute
- return solrHome.resolve(PackageStoreAPI.PACKAGESTORE_DIRECTORY + path);
+ if (path.startsWith("\\\\")) { // Windows absolute UNC
+ throw new SolrException(BAD_REQUEST, "Illegal path " + path);
+ }
+ while (path.startsWith("/")) { // Trim all leading slashes
Review comment:
Yes, and the reason the old code added a leading slash was that it id
string concatenation `PackageStoreAPI.PACKAGESTORE_DIRECTORY + path`, while the
new code does `resolve(path)`. With string concat you need a leading slash to
get a sub folder of pkgStore, while if you have a leading slash with
Path.resolve, you end up with a an absolute path. However I'll re-factor this
whole part and add some tests.
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