From: Tom Lendacky Date: Thu, 22 Jun 2023 13:45:05 +0000 (-0500) Subject: x86/sev: Change npages to unsigned long in snp_accept_memory() X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=62d5e970d022ef4bde18948dd67247c3194384c1;p=linux.git 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 Signed-off-by: Borislav Petkov (AMD) Cc: Link: https://lore.kernel.org/r/6d511c25576494f682063c9fb6c705b526a3757e.1687441505.git.thomas.lendacky@amd.com --- diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c index 2787826d9f607..d8c1e3be74c0b 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;