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From: B Horn <b@horn.uk>
Date: Sun, 12 May 2024 06:37:08 +0100
Subject: fs/iso9660: Set a grub_errno if mount fails
It was possible for a grub_errno to not be set if mount of an ISO 9660
filesystem failed when set_rockridge() returned 0.
This isn't known to be exploitable as the other filesystems due to
filesystem helper checking the requested file type. Though fixing
as a precaution.
Reported-by: B Horn <b@horn.uk>
Signed-off-by: B Horn <b@horn.uk>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
grub-core/fs/iso9660.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/grub-core/fs/iso9660.c b/grub-core/fs/iso9660.c
index 8c348b5..8d480e6 100644
--- a/grub-core/fs/iso9660.c
+++ b/grub-core/fs/iso9660.c
@@ -551,6 +551,9 @@ grub_iso9660_mount (grub_disk_t disk)
return data;
fail:
+ if (grub_errno == GRUB_ERR_NONE)
+ grub_error (GRUB_ERR_BAD_FS, "not a ISO9660 filesystem");
+
grub_free (data);
return 0;
}
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