diff options
| author | Tom Lendacky <thomas.lendacky@amd.com> | 2023-06-22 08:45:05 -0500 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2023-10-02 14:55:41 +0200 |
| commit | 62d5e970d022ef4bde18948dd67247c3194384c1 (patch) | |
| tree | f1d1ec383e920c940e9236ee5ba94741e9f2a510 | |
| parent | 6bc6f7d9d7ac3cdbe9e8b0495538b4a0cc11f032 (diff) | |
| download | vfs-62d5e970d022ef4bde18948dd67247c3194384c1.tar.gz | |
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
| -rw-r--r-- | arch/x86/kernel/sev.c | 3 |
1 files changed, 1 insertions, 2 deletions
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; |