Commit 62d5e970 authored by Tom Lendacky's avatar Tom Lendacky Committed by Borislav Petkov (AMD)
Browse files

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



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: 6c321179 ("x86/sev: Add SNP-specific unaccepted memory support")
Signed-off-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Cc: <stable@kernel.org>
Link: https://lore.kernel.org/r/6d511c25576494f682063c9fb6c705b526a3757e.1687441505.git.thomas.lendacky@amd.com
parent 6bc6f7d9

arch/x86/kernel/sev.c

+1 −2
Original line number Diff line number Diff line
@@ -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;