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vsock_addr: Check for supported flag values

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Check if the provided flags value from the vsock address data structure
includes the supported flags in the corresponding kernel version.

The first byte of the "svm_zero" field is used as "svm_flags", so add
the flags check instead.

Changelog

v3 -> v4

* New patch in v4.

Signed-off-by: Andra Paraschiv <andraprs@amazon.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Andra Paraschiv 2020-12-14 18:11:20 +02:00 committed by Jakub Kicinski
parent caaf95e0f2
commit cada7ccd9d
1 changed files with 3 additions and 1 deletions
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4
net/vmw_vsock/vsock_addr.c
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@ -22,13 +22,15 @@ EXPORT_SYMBOL_GPL(vsock_addr_init);
int vsock_addr_validate(const struct sockaddr_vm *addr) int vsock_addr_validate(const struct sockaddr_vm *addr)
{ {
__u8 svm_valid_flags = VMADDR_FLAG_TO_HOST;
if (!addr) if (!addr)
return -EFAULT; return -EFAULT;
if (addr->svm_family != AF_VSOCK) if (addr->svm_family != AF_VSOCK)
return -EAFNOSUPPORT; return -EAFNOSUPPORT;
if (addr->svm_zero[0] != 0) if (addr->svm_flags & ~svm_valid_flags)
return -EINVAL; return -EINVAL;
return 0; return 0;