> On Jan 18, 2023, at 8:07 AM, Thomas Schmitt <scdbac...@gmx.net> wrote:
>
> Hi,
>
> On Wed, 18 Jan 2023 08:23:54 +0000 Lidong Chen <lidong.c...@oracle.com> wrote:
>> There is no check for the end of block when reading
>> directory extents. It resulted in read_node() always
>> read from the same offset in the while loop, thus
>> caused infinite loop. The fix added a check for the
>> end of the block and ensure the read is within directory
>> boundary.
>>
>> Signed-off-by: Lidong Chen <lidong.c...@oracle.com>
>> Reviewed-by: Thomas Schmitt <scdbac...@gmx.net>
>> ---
>> grub-core/fs/iso9660.c | 21 +++++++++++++++++++++
>> 1 file changed, 21 insertions(+)
>>
>> diff --git a/grub-core/fs/iso9660.c b/grub-core/fs/iso9660.c
>> index 91817ec1f..4f4cd6165 100644
>> --- a/grub-core/fs/iso9660.c
>> +++ b/grub-core/fs/iso9660.c
>> @@ -795,6 +795,15 @@ grub_iso9660_iterate_dir (grub_fshelp_node_t dir,
>> while (dirent.flags & FLAG_MORE_EXTENTS)
>> {
>> offset += dirent.len;
>> +
>> + /* offset should within the dir's len. */
>> + if (offset > len)
>> + {
>> + if (ctx.filename_alloc)
>> + grub_free (ctx.filename);
>> + return 0;
>> + }
>> +
>> if (read_node (dir, offset, sizeof (dirent), (char *) &dirent))
>> {
>> if (ctx.filename_alloc)
>> @@ -802,6 +811,18 @@ grub_iso9660_iterate_dir (grub_fshelp_node_t dir,
>> grub_free (node);
>> return 0;
>> }
>> +
>> + /*
>> + * It is either the end of block or zero-padded sector,
>> + * skip to the next block.
>> + */
>> + if (!dirent.len)
>> + {
>> + offset = (offset / GRUB_ISO9660_BLKSZ + 1) * GRUB_ISO9660_BLKSZ;
>> + dirent.flags |= FLAG_MORE_EXTENTS;
>> + continue;
>> + }
>> +
>> if (node->have_dirents >= node->alloc_dirents)
>> {
>> struct grub_fshelp_node *new_node;
>> --
>> 2.35.1
>
> Reviewed-by: Thomas Schmitt <scdbac...@gmx.net>
>
> (I'm not sure whether is appropriate to add another Reviewed-by after it
> was already given and only a minor cosmetic change was made to the patch.
> If this is not ok, then please give me a note.)
>
>
To me, having another ‘Reviewed-by’ is a confirmation that the v2 change is
accepted.
Thanks,
Lidong
> Have a nice day :)
>
> Thomas
>
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