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Re: New Defects reported by Coverity Scan for XenProject
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 12 Nov 2026 09:31:47 +0100
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- Delivery-date: Thu, 12 Nov 2026 08:31:52 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.11.2026 18:36, scan-admin@xxxxxxxxxxxx wrote:
> ** CID 1706678: Integer handling issues (INTEGER_OVERFLOW)
> /xen/arch/x86/efi/efi-boot.h: 38 in edd_put_string()
>
>
> _____________________________________________________________________________________________
> *** CID 1706678: Integer handling issues (INTEGER_OVERFLOW)
> /xen/arch/x86/efi/efi-boot.h: 38 in edd_put_string()
> 32 {
> 33 for ( ; n && *src; --n )
> 34 *dst++ = *src++;
> 35 if ( *src )
> 36 PrintErrMesg(L"Internal error populating EDD info",
> 37 EFI_BUFFER_TOO_SMALL);
>>>> CID 1706678: Integer handling issues (INTEGER_OVERFLOW)
>>>> Expression "n--", where "n" is known to be equal to
>>>> 18446744073709551615, underflows the type of "n--", which is type "size_t".
> 38 while ( n-- )
> 39 *dst++ = ' ';
> 40 }
> 41 #define edd_put_string(d, s) edd_put_string(d, ARRAY_SIZE(d), s)
> 42
> 43 extern const intpte_t __page_tables_start[], __page_tables_end[];
What is the tool trying to tell us here. Yes, the underflow is real. But
how does it matter, when the loop then terminates and n isn't further
used after the loop?
Jan
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