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| author | J. Bruce Fields <bfields@redhat.com> | 2013-06-26 11:09:06 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-07-25 14:07:31 -0700 |
| commit | 57370589c166cc8747f5e09365407d9dc04d7425 (patch) | |
| tree | 2b938480284ef58661701005613770b0604d4bff /net/sunrpc/svcsock.c | |
| parent | c814208bb3542333629cc3c9e79666e94425899a (diff) | |
| download | linux-3.10-57370589c166cc8747f5e09365407d9dc04d7425.tar.gz linux-3.10-57370589c166cc8747f5e09365407d9dc04d7425.tar.bz2 linux-3.10-57370589c166cc8747f5e09365407d9dc04d7425.zip | |
svcrpc: fix handling of too-short rpc's
commit cf3aa02cb4a0c5af5557dd47f15a08a7df33182a upstream.
If we detect that an rpc is too short, we abort and close the
connection. Except, there's a bug here: we're leaving sk_datalen
nonzero without leaving any pages in the sk_pages array. The most
likely result of the inconsistency is a subsequent crash in
svc_tcp_clear_pages.
Also demote the BUG_ON in svc_tcp_clear_pages to a WARN.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/sunrpc/svcsock.c')
| -rw-r--r-- | net/sunrpc/svcsock.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c index 0f679df7d07..df74919c81c 100644 --- a/net/sunrpc/svcsock.c +++ b/net/sunrpc/svcsock.c @@ -917,7 +917,10 @@ static void svc_tcp_clear_pages(struct svc_sock *svsk) len = svsk->sk_datalen; npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; for (i = 0; i < npages; i++) { - BUG_ON(svsk->sk_pages[i] == NULL); + if (svsk->sk_pages[i] == NULL) { + WARN_ON_ONCE(1); + continue; + } put_page(svsk->sk_pages[i]); svsk->sk_pages[i] = NULL; } @@ -1092,8 +1095,10 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp) goto err_noclose; } - if (svc_sock_reclen(svsk) < 8) + if (svc_sock_reclen(svsk) < 8) { + svsk->sk_datalen = 0; goto err_delete; /* client is nuts. */ + } rqstp->rq_arg.len = svsk->sk_datalen; rqstp->rq_arg.page_base = 0; |