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| author | J. Bruce Fields <bfields@redhat.com> | 2012-08-09 18:12:28 -0400 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2012-08-20 18:38:44 -0400 |
| commit | be1e44441a560c43c136a562d49a1c9623c91197 (patch) | |
| tree | 3ebff386ad8128bb2d004236340ec2e1bf5ce25f /net | |
| parent | 39307655a1effa8d913bba054c0e985bfaca808c (diff) | |
| download | lwn-be1e44441a560c43c136a562d49a1c9623c91197.tar.gz lwn-be1e44441a560c43c136a562d49a1c9623c91197.zip | |
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')
| -rw-r--r-- | net/sunrpc/svcsock.c | 2 |
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; |