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Fix ResolveLinkTarget crashing on exFAT drives (#15568)

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theguymadmax 2025-11-21 23:14:39 -05:00 committed by GitHub
parent 29b3aa8543
commit fbb9a0b2c7
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1 changed files with 34 additions and 8 deletions
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42
MediaBrowser.Controller/IO/FileSystemHelper.cs
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@ -63,6 +63,29 @@ public static class FileSystemHelper
}
}
/// <summary>
/// Resolves a single link hop for the specified path.
/// </summary>
/// <remarks>
/// Returns <c>null</c> if the path is not a symbolic link or the filesystem does not support link resolution (e.g., exFAT).
/// </remarks>
/// <param name="path">The file path to resolve.</param>
/// <returns>
/// A <see cref="FileInfo"/> representing the next link target if the path is a link; otherwise, <c>null</c>.
/// </returns>
private static FileInfo? Resolve(string path)
{
try
{
return File.ResolveLinkTarget(path, returnFinalTarget: false) as FileInfo;
}
catch (IOException)
{
// Filesystem doesn't support links (e.g., exFAT).
return null;
}
}
/// <summary>
/// Gets the target of the specified file link.
/// </summary>
@ -84,23 +107,26 @@ public static class FileSystemHelper
if (!returnFinalTarget)
{
return File.ResolveLinkTarget(linkPath, returnFinalTarget: false) as FileInfo;
return Resolve(linkPath);
}
if (File.ResolveLinkTarget(linkPath, returnFinalTarget: false) is not FileInfo targetInfo)
{
return null;
}
if (!targetInfo.Exists)
var targetInfo = Resolve(linkPath);
if (targetInfo is null || !targetInfo.Exists)
{
return targetInfo;
}
var currentPath = targetInfo.FullName;
var visited = new HashSet<string>(StringComparer.Ordinal) { linkPath, currentPath };
while (File.ResolveLinkTarget(currentPath, returnFinalTarget: false) is FileInfo linkInfo)
while (true)
{
var linkInfo = Resolve(currentPath);
if (linkInfo is null)
{
break;
}
var targetPath = linkInfo.FullName;
// If an infinite loop is detected, return the file info for the