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nfs: check for integer overflow in decode_devicenotify_args() 

On 32 bit, if n is too large then "n * sizeof(*args->devs)" could
overflow and args->devs would be smaller than expected.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Dan Carpenter 2012-01-12 10:16:14 +03:00 committed by Trond Myklebust
parent 13fff2f35f
commit 363e0df057
1 changed files with 4 additions and 0 deletions
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4
fs/nfs/callback_xdr.c
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@ -305,6 +305,10 @@ __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
n = ntohl(*p++); n = ntohl(*p++);
if (n <= 0) if (n <= 0)
goto out; goto out;
if (n > ULONG_MAX / sizeof(*args->devs)) {
status = htonl(NFS4ERR_BADXDR);
goto out;
}
args->devs = kmalloc(n * sizeof(*args->devs), GFP_KERNEL); args->devs = kmalloc(n * sizeof(*args->devs), GFP_KERNEL);
if (!args->devs) { if (!args->devs) {