[PATCH] fs: prevent out-of-bounds array speculation when closing a file descriptor

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Google-Bug-Id: 114199369
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
---
 fs/file.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/file.c b/fs/file.c
index abb8b7081d7a..73189eaad1df 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -632,6 +632,7 @@ int __close_fd(struct files_struct *files, unsigned fd)
 	fdt = files_fdtable(files);
 	if (fd >= fdt->max_fds)
 		goto out_unlock;
+	fd = array_index_nospec(fd, fdt->max_fds);
 	file = fdt->fd[fd];
 	if (!file)
 		goto out_unlock;
-- 
2.24.1




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