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x86/sev: Change npages to unsigned long in snp_accept_memory()

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In snp_accept_memory(), the npages variables value is calculated from
phys_addr_t variables but is an unsigned int. A very large range passed
into snp_accept_memory() could lead to truncating npages to zero. This
doesn't happen at the moment but let's be prepared.

Fixes: 6c32117963 ("x86/sev: Add SNP-specific unaccepted memory support")
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: <stable@kernel.org>
Link: https://lore.kernel.org/r/6d511c25576494f682063c9fb6c705b526a3757e.1687441505.git.thomas.lendacky@amd.com
This commit is contained in:
Tom Lendacky 2023-06-22 08:45:05 -05:00 committed by Borislav Petkov (AMD)
parent 6bc6f7d9d7
commit 62d5e970d0
1 changed files with 1 additions and 2 deletions
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3
arch/x86/kernel/sev.c
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@ -868,8 +868,7 @@ void snp_set_memory_private(unsigned long vaddr, unsigned long npages)
void snp_accept_memory(phys_addr_t start, phys_addr_t end)
{
unsigned long vaddr;
unsigned int npages;
unsigned long vaddr, npages;
if (!cc_platform_has(CC_ATTR_GUEST_SEV_SNP))
return;