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NFSv4.1: Fix uninitialised variable in devicenotify 

When decode_devicenotify_args() exits with no entries, we need to
ensure that the struct cb_devicenotifyargs is initialised to
{ 0, NULL } in order to avoid problems in
nfs4_callback_devicenotify().

Reported-by: <rtm@csail.mit.edu>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2022-01-03 14:50:16 -05:00 committed by Anna Schumaker
parent fbd2057e53
commit b05bf5c63b
3 changed files with 11 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/nfs/callback.h
View File

@ -170,7 +170,7 @@ struct cb_devicenotifyitem {
};
struct cb_devicenotifyargs {
int ndevs;
uint32_t ndevs;
struct cb_devicenotifyitem *devs;
};

2
fs/nfs/callback_proc.c
View File

@ -358,7 +358,7 @@ __be32 nfs4_callback_devicenotify(void *argp, void *resp,
struct cb_process_state *cps)
{
struct cb_devicenotifyargs *args = argp;
int i;
uint32_t i;
__be32 res = 0;
struct nfs_client *clp = cps->clp;
struct nfs_server *server = NULL;

18
fs/nfs/callback_xdr.c
View File

@ -258,11 +258,9 @@ __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
void *argp)
{
struct cb_devicenotifyargs *args = argp;
uint32_t tmp, n, i;
__be32 *p;
__be32 status = 0;
u32 tmp;
int n, i;
args->ndevs = 0;
/* Num of device notifications */
p = xdr_inline_decode(xdr, sizeof(uint32_t));
@ -271,7 +269,7 @@ __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
goto out;
}
n = ntohl(*p++);
if (n <= 0)
if (n == 0)
goto out;
if (n > ULONG_MAX / sizeof(*args->devs)) {
status = htonl(NFS4ERR_BADXDR);
@ -330,19 +328,21 @@ __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
dev->cbd_immediate = 0;
}
args->ndevs++;
dprintk("%s: type %d layout 0x%x immediate %d\n",
__func__, dev->cbd_notify_type, dev->cbd_layout_type,
dev->cbd_immediate);
}
args->ndevs = n;
dprintk("%s: ndevs %d\n", __func__, args->ndevs);
return 0;
err:
kfree(args->devs);
out:
args->devs = NULL;
args->ndevs = 0;
dprintk("%s: status %d ndevs %d\n",
__func__, ntohl(status), args->ndevs);
return status;
err:
kfree(args->devs);
goto out;
}
static __be32 decode_sessionid(struct xdr_stream *xdr,