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Re: [PATCH 2/3] hvmloader: fix SMBIOS table length checks
- To: Petr Beneš <w1benny@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 2 Jul 2025 08:59:29 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 02 Jul 2025 06:59:45 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02.07.2025 01:45, Petr Beneš wrote:
> --- a/tools/firmware/hvmloader/smbios.c
> +++ b/tools/firmware/hvmloader/smbios.c
> @@ -385,7 +385,7 @@ smbios_type_0_init(void *start, const char *xen_version,
> uint32_t length;
>
> pts = get_smbios_pt_struct(0, &length);
> - if ( pts != NULL && length > 0 )
> + if ( pts != NULL && length >= sizeof(struct smbios_type_0) )
Please preferably use an actual variable that's available, i.e. sizeof(*p) in
cases like this one.
Also, patch 1 touched this very line. Adjusting style while touching a line
is quite fine, and typically even preferred over touching the same line twice
in close succession.
> @@ -504,7 +504,7 @@ smbios_type_2_init(void *start)
> unsigned int counter = 0;
>
> pts = get_smbios_pt_struct(2, &length);
> - if ( pts != NULL && length > 0 )
> + if ( pts != NULL && length >= 8 )
No way to have (even uncommented) literal numbers like this in the code.
This can be expressed using offsetof(), I expect, and hence wants expressing
that way. Seeing the respective member's name will then also aid reviewing.
Jan
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