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authorJ. Bruce Fields <bfields@redhat.com>2012-12-05 00:25:10 +0100
committerJ. Bruce Fields <bfields@redhat.com>2012-12-18 03:55:21 +0100
commitd5f50b0c290431c65377c4afa1c764e2c3fe5305 (patch)
tree9d08b4a0a8a1aed35de43ec55cd0a94fbab2e015 /fs/nfsd/nfs4xdr.c
parentnfsd4: disable zero-copy on non-final read ops (diff)
downloadlinux-d5f50b0c290431c65377c4afa1c764e2c3fe5305.tar.xz
linux-d5f50b0c290431c65377c4afa1c764e2c3fe5305.zip
nfsd4: fix oops on unusual readlike compound
If the argument and reply together exceed the maximum payload size, then a reply with a read-like operation can overlow the rq_pages array. Cc: stable@kernel.org Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd/nfs4xdr.c')
-rw-r--r--fs/nfsd/nfs4xdr.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 3bf8a9d7f217..d7a3be5ab777 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -2925,11 +2925,16 @@ nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
len = maxcount;
v = 0;
while (len > 0) {
- pn = resp->rqstp->rq_resused++;
+ pn = resp->rqstp->rq_resused;
+ if (!resp->rqstp->rq_respages[pn]) { /* ran out of pages */
+ maxcount -= len;
+ break;
+ }
resp->rqstp->rq_vec[v].iov_base =
page_address(resp->rqstp->rq_respages[pn]);
resp->rqstp->rq_vec[v].iov_len =
len < PAGE_SIZE ? len : PAGE_SIZE;
+ resp->rqstp->rq_resused++;
v++;
len -= PAGE_SIZE;
}
@@ -2975,6 +2980,8 @@ nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd
return nfserr;
if (resp->xbuf->page_len)
return nfserr_resource;
+ if (!resp->rqstp->rq_respages[resp->rqstp->rq_resused])
+ return nfserr_resource;
page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
@@ -3024,6 +3031,8 @@ nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4
return nfserr;
if (resp->xbuf->page_len)
return nfserr_resource;
+ if (!resp->rqstp->rq_respages[resp->rqstp->rq_resused])
+ return nfserr_resource;
RESERVE_SPACE(NFS4_VERIFIER_SIZE);
savep = p;