diff mbox series

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

Message ID 6d511c25576494f682063c9fb6c705b526a3757e.1687441505.git.thomas.lendacky@amd.com
State New
Headers
Series x86/sev: Change npages to unsigned long in snp_accept_memory() |

Commit Message

Tom Lendacky June 22, 2023, 1:45 p.m. UTC 
  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.

Fixes: 6c3211796326 ("x86/sev: Add SNP-specific unaccepted memory support")
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
---
 arch/x86/kernel/sev.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c
index 1ee7bed453de..2b0342a03c1b 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;