File 0028-fs-f2fs-Do-not-copy-file-names-that-are-to... of Package grub2

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File 0028-fs-f2fs-Do-not-copy-file-names-that-are-too-long.patch of Package grub2 (Revision 08a5a61cad48e6ed9469ca11ffcb9b86)

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From 315e2773ed5cae92548d4508301ac0fe7515e5bb Mon Sep 17 00:00:00 2001
From: Sudhakar Kuppusamy <sudhakar@linux.ibm.com>
Date: Wed, 6 Apr 2022 18:17:43 +0530
Subject: [PATCH 28/32] fs/f2fs: Do not copy file names that are too long

A corrupt f2fs file system might specify a name length which is greater
than the maximum name length supported by the GRUB f2fs driver.

We will allocate enough memory to store the overly long name, but there
are only F2FS_NAME_LEN bytes in the source, so we would read past the end
of the source.

While checking directory entries, do not copy a file name with an invalid
length.

Signed-off-by: Sudhakar Kuppusamy <sudhakar@linux.ibm.com>
Signed-off-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/fs/f2fs.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/grub-core/fs/f2fs.c b/grub-core/fs/f2fs.c
index 8898b235e0..df6beb544c 100644
--- a/grub-core/fs/f2fs.c
+++ b/grub-core/fs/f2fs.c
@@ -1003,6 +1003,10 @@ grub_f2fs_check_dentries (struct grub_f2fs_dir_iter_ctx *ctx)
 
       ftype = ctx->dentry[i].file_type;
       name_len = grub_le_to_cpu16 (ctx->dentry[i].name_len);
+
+      if (name_len >= F2FS_NAME_LEN)
+        return 0;
+
       filename = grub_malloc (name_len + 1);
       if (!filename)
         return 0;
-- 
2.34.1

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File 0028-fs-f2fs-Do-not-copy-file-names-that-are-too-long.patch of Package grub2 (Revision 08a5a61cad48e6ed9469ca11ffcb9b86)

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