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authorDan Carpenter <dan.carpenter@oracle.com>2012-01-12 11:16:14 +0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-01-13 01:30:07 +0400
commit363e0df057ea8da539645fe4c3c227e3d44054cc (patch)
tree9248304c9e407720e328c8cb4001dd3abaa74758 /fs/nfs/callback_xdr.c
parent13fff2f35fd21d69ee84ef6a78610420e1a42818 (diff)
downloadlinux-363e0df057ea8da539645fe4c3c227e3d44054cc.tar.xz
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>
Diffstat (limited to 'fs/nfs/callback_xdr.c')
-rw-r--r--fs/nfs/callback_xdr.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/nfs/callback_xdr.c b/fs/nfs/callback_xdr.c
index 726e59a9e50f..d50b2742f23b 100644
--- a/fs/nfs/callback_xdr.c
+++ b/fs/nfs/callback_xdr.c
@@ -305,6 +305,10 @@ __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
n = ntohl(*p++);
if (n <= 0)
goto out;
+ if (n > ULONG_MAX / sizeof(*args->devs)) {
+ status = htonl(NFS4ERR_BADXDR);
+ goto out;
+ }
args->devs = kmalloc(n * sizeof(*args->devs), GFP_KERNEL);
if (!args->devs) {