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authorJ. Bruce Fields <bfields@redhat.com>2012-08-09 18:12:28 -0400
committerJ. Bruce Fields <bfields@redhat.com>2012-08-20 18:38:44 -0400
commitbe1e44441a560c43c136a562d49a1c9623c91197 (patch)
tree3ebff386ad8128bb2d004236340ec2e1bf5ce25f /net/sunrpc
parent39307655a1effa8d913bba054c0e985bfaca808c (diff)
downloadlinux-be1e44441a560c43c136a562d49a1c9623c91197.tar.bz2
svcrpc: fix BUG() in svc_tcp_clear_pages
Examination of svc_tcp_clear_pages shows that it assumes sk_tcplen is consistent with sk_pages[] (in particular, sk_pages[n] can't be NULL if sk_tcplen would lead us to expect n pages of data). svc_tcp_restore_pages zeroes out sk_pages[] while leaving sk_tcplen. This is OK, since both functions are serialized by XPT_BUSY. However, that means the inconsistency must be repaired before dropping XPT_BUSY. Therefore we should be ensuring that svc_tcp_save_pages repairs the problem before exiting svc_tcp_recv_record on error. Symptoms were a BUG() in svc_tcp_clear_pages. Cc: stable@vger.kernel.org Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/svcsock.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index 18bc130255a7..998aa8c1807c 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -1129,9 +1129,9 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
if (len >= 0)
svsk->sk_tcplen += len;
if (len != want) {
+ svc_tcp_save_pages(svsk, rqstp);
if (len < 0 && len != -EAGAIN)
goto err_other;
- svc_tcp_save_pages(svsk, rqstp);
dprintk("svc: incomplete TCP record (%d of %d)\n",
svsk->sk_tcplen, svsk->sk_reclen);
goto err_noclose;