libxfs: don't barf in libxfs_bwrite on a null buffer ops name

Don't crash if we failed to write a buffer that had no buffer verifier.
This should be rare in practice, but coverity found a valid bug.

Coverity-id: 1460462
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

diff --git a/libxfs/rdwr.c b/libxfs/rdwr.c
index 3c43a4d0dab5c91d61fe324fda5f3c1a8fec438a..8a6902699026f9147414ef0cc06d0267a11ad8e3 100644 (file)
--- a/libxfs/rdwr.c
+++ b/libxfs/rdwr.c
@@ -1028,7 +1028,7 @@ libxfs_bwrite(
        if (bp->b_error) {
                fprintf(stderr,
        _("%s: write failed on %s bno 0x%llx/0x%x, err=%d\n"),
-                       __func__, bp->b_ops->name,
+                       __func__, bp->b_ops ? bp->b_ops->name : "(unknown)",
                        (long long)bp->b_bn, bp->b_bcount, -bp->b_error);
        } else {
                bp->b_flags |= LIBXFS_B_UPTODATE;