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hw/9pfs: avoid buffer overrun 

v9fs_add_dir_node and qemu_v9fs_synth_add_file used strncpy
to form node->name, which requires NUL-termination, but
strncpy does not ensure NUL-termination.
Use pstrcpy, which does.

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>
This commit is contained in:
Jim Meyering 2012-10-04 13:09:49 +02:00 committed by Anthony Liguori
parent d66f8e7bd3
commit a79b5f8b80
1 changed files with 2 additions and 2 deletions
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4
hw/9pfs/virtio-9p-synth.c
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@ -58,7 +58,7 @@ static V9fsSynthNode *v9fs_add_dir_node(V9fsSynthNode *parent, int mode,
node->attr->read = NULL;
}
node->private = node;
strncpy(node->name, name, sizeof(node->name));
pstrcpy(node->name, sizeof(node->name), name);
QLIST_INSERT_HEAD_RCU(&parent->child, node, sibling);
return node;
}
@ -132,7 +132,7 @@ int qemu_v9fs_synth_add_file(V9fsSynthNode *parent, int mode,
node->attr->write = write;
node->attr->mode = mode;
node->private = arg;
strncpy(node->name, name, sizeof(node->name));
pstrcpy(node->name, sizeof(node->name), name);
QLIST_INSERT_HEAD_RCU(&parent->child, node, sibling);
ret = 0;
err_out: