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authorJim Meyering <meyering@redhat.com>2012-10-04 13:09:56 +0200
committerAnthony Liguori <aliguori@us.ibm.com>2012-10-05 07:58:37 -0500
commit9238c2099d37748a4e2cbbe709ed1ebffa6f3c8b (patch)
treea2a3b8b714380d4c8e6013b795c0a70f157fc48a
parente5fda03839e3c61b01d6c60de5625501d01c69d0 (diff)
virtio-9p: avoid unwarranted uses of strncpy
In all of these cases, the uses of strncpy were unnecessary, since at each point of use we know that the NUL-terminated source bytes fit in the destination buffer. Use memcpy in place of strncpy. Acked-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Jim Meyering <meyering@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
-rw-r--r--hw/9pfs/virtio-9p-posix-acl.c6
-rw-r--r--hw/9pfs/virtio-9p-xattr-user.c3
-rw-r--r--hw/9pfs/virtio-9p-xattr.c3
3 files changed, 8 insertions, 4 deletions
diff --git a/hw/9pfs/virtio-9p-posix-acl.c b/hw/9pfs/virtio-9p-posix-acl.c
index a1948e3aff..c064017b1f 100644
--- a/hw/9pfs/virtio-9p-posix-acl.c
+++ b/hw/9pfs/virtio-9p-posix-acl.c
@@ -44,7 +44,8 @@ static ssize_t mp_pacl_listxattr(FsContext *ctx, const char *path,
return -1;
}
- strncpy(value, ACL_ACCESS, len);
+ /* len includes the trailing NUL */
+ memcpy(value, ACL_ACCESS, len);
return 0;
}
@@ -95,7 +96,8 @@ static ssize_t mp_dacl_listxattr(FsContext *ctx, const char *path,
return -1;
}
- strncpy(value, ACL_DEFAULT, len);
+ /* len includes the trailing NUL */
+ memcpy(value, ACL_ACCESS, len);
return 0;
}
diff --git a/hw/9pfs/virtio-9p-xattr-user.c b/hw/9pfs/virtio-9p-xattr-user.c
index 5044a3e5ab..5bb6020070 100644
--- a/hw/9pfs/virtio-9p-xattr-user.c
+++ b/hw/9pfs/virtio-9p-xattr-user.c
@@ -61,7 +61,8 @@ static ssize_t mp_user_listxattr(FsContext *ctx, const char *path,
return -1;
}
- strncpy(value, name, name_size);
+ /* name_size includes the trailing NUL. */
+ memcpy(value, name, name_size);
return name_size;
}
diff --git a/hw/9pfs/virtio-9p-xattr.c b/hw/9pfs/virtio-9p-xattr.c
index 7f08f6e176..a83960676d 100644
--- a/hw/9pfs/virtio-9p-xattr.c
+++ b/hw/9pfs/virtio-9p-xattr.c
@@ -53,7 +53,8 @@ ssize_t pt_listxattr(FsContext *ctx, const char *path,
return -1;
}
- strncpy(value, name, name_size);
+ /* no need for strncpy: name_size is strlen(name)+1 */
+ memcpy(value, name, name_size);
return name_size;
}