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NFS: Fix misparsing of nfsv4 fs_locations attribute (take 2) 

The changeset ea31a4437c (nfs: Fix
misparsing of nfsv4 fs_locations attribute) causes the mountpath that is
calculated at the beginning of try_location() to be clobbered when we
later strncpy a non-nul terminated hostname using an incorrect buffer
length.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2009-03-10 20:33:17 -04:00
parent eb9b55ab4d
commit ef95d31e6d
1 changed files with 8 additions and 7 deletions
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15
fs/nfs/nfs4namespace.c
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@ -21,7 +21,9 @@
#define NFSDBG_FACILITY NFSDBG_VFS
/*
* Check if fs_root is valid
* Convert the NFSv4 pathname components into a standard posix path.
*
* Note that the resulting string will be placed at the end of the buffer
*/
static inline char *nfs4_pathname_string(const struct nfs4_pathname *pathname,
char *buffer, ssize_t buflen)
@ -99,21 +101,20 @@ static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
{
struct vfsmount *mnt = ERR_PTR(-ENOENT);
char *mnt_path;
int page2len;
unsigned int maxbuflen;
unsigned int s;
mnt_path = nfs4_pathname_string(&location->rootpath, page2, PAGE_SIZE);
if (IS_ERR(mnt_path))
return mnt;
mountdata->mnt_path = mnt_path;
page2 += strlen(mnt_path) + 1;
page2len = PAGE_SIZE - strlen(mnt_path) - 1;
maxbuflen = mnt_path - 1 - page2;
for (s = 0; s < location->nservers; s++) {
const struct nfs4_string *buf = &location->servers[s];
struct sockaddr_storage addr;
if (buf->len <= 0 || buf->len >= PAGE_SIZE)
if (buf->len <= 0 || buf->len >= maxbuflen)
continue;
mountdata->addr = (struct sockaddr *)&addr;
@ -126,8 +127,8 @@ static struct vfsmount *try_location(struct nfs_clone_mount *mountdata,
continue;
nfs_set_port(mountdata->addr, NFS_PORT);
strncpy(page2, buf->data, page2len);
page2[page2len] = '\0';
memcpy(page2, buf->data, buf->len);
page2[buf->len] = '\0';
mountdata->hostname = page2;
snprintf(page, PAGE_SIZE, "%s:%s",