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authorTom Lendacky <thomas.lendacky@amd.com>2023-06-22 08:45:05 -0500
committerBorislav Petkov (AMD) <bp@alien8.de>2023-10-02 14:55:41 +0200
commit62d5e970d022ef4bde18948dd67247c3194384c1 (patch)
treef1d1ec383e920c940e9236ee5ba94741e9f2a510 /arch
parent6bc6f7d9d7ac3cdbe9e8b0495538b4a0cc11f032 (diff)
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: 6c3211796326 ("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
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/sev.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c
index 2787826d9f60..d8c1e3be74c0 100644
--- a/arch/x86/kernel/sev.c
+++ b/arch/x86/kernel/sev.c
@@ -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;