From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: Sascha Hauer <s.hauer@pengutronix.de>,
Barebox List <barebox@lists.infradead.org>
Subject: Re: [PATCH 2/2] partitions: efi: Fix MAX_PARTITION check
Date: Wed, 2 Jun 2021 11:17:08 +0200 [thread overview]
Message-ID: <49735235-eb7b-00e4-7f5a-41ec5c3a1080@pengutronix.de> (raw)
In-Reply-To: <20210602071533.10093-2-s.hauer@pengutronix.de>
On 02.06.21 09:15, Sascha Hauer wrote:
> The GPT partiton parser has a check which should check if the GPT has
> more partitions than we support. This doesn't work because the loop
> iterating over the partitions exits with a maximum i of MAX_PARTITION,
> i > MAX_PARTITION will never be true. Fix the check.
>
> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
> ---
> common/partitions/efi.c | 13 ++++++++-----
> 1 file changed, 8 insertions(+), 5 deletions(-)
>
> diff --git a/common/partitions/efi.c b/common/partitions/efi.c
> index 437c3d64f8..135b08901a 100644
> --- a/common/partitions/efi.c
> +++ b/common/partitions/efi.c
> @@ -446,7 +446,14 @@ static void efi_partition(void *buf, struct block_device *blk,
> }
>
> nb_part = le32_to_cpu(gpt->num_partition_entries);
> - for (i = 0; i < MAX_PARTITION && i < nb_part; i++) {
> +
> + if (nb_part > MAX_PARTITION) {
> + dev_warn(blk->dev, "GPT has more partitions than we support (%d) > max partition number (%d)\n",
> + nb_part, MAX_PARTITION);
> + nb_part = MAX_PARTITION;
> + }
> +
> + for (i = 0; i < nb_part; i++) {
> if (!is_pte_valid(&ptes[i], last_lba(blk))) {
> dev_dbg(blk->dev, "Invalid pte %d\n", i);
> return;
> @@ -460,10 +467,6 @@ static void efi_partition(void *buf, struct block_device *blk,
> snprintf(pentry->partuuid, sizeof(pentry->partuuid), "%pUl", &ptes[i].unique_partition_guid);
> pd->used_entries++;
> }
> -
> - if (i > MAX_PARTITION)
> - dev_warn(blk->dev, "num_partition_entries (%d) > max partition number (%d)\n",
> - nb_part, MAX_PARTITION);
> }
>
> static struct partition_parser efi_partition_parser = {
>
--
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next prev parent reply other threads:[~2021-06-02 9:19 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-02 7:15 [PATCH 1/2] partitions: Increase MAX_PARTITION to 128 Sascha Hauer
2021-06-02 7:15 ` [PATCH 2/2] partitions: efi: Fix MAX_PARTITION check Sascha Hauer
2021-06-02 9:17 ` Ahmad Fatoum [this message]
2021-06-02 9:20 ` [PATCH 1/2] partitions: Increase MAX_PARTITION to 128 Ahmad Fatoum
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