xfs: reset buffer pointers before freeing them

When we free a vmapped buffer, we need to ensure the vmap address
and length we free is the same as when it was allocated. In various
places in the log code we change the memory the buffer is pointing
to before issuing IO, but we never reset the buffer to point back to
it's original memory (or no memory, if that is the case for the
buffer).

As a result, when we free the buffer it points to memory that is
owned by something else and attempts to unmap and free it. Because
the range does not match any known mapped range, it can trigger
BUG_ON() traps in the vmap code, and potentially corrupt the vmap
area tracking.

Fix this by always resetting these buffers to their original state
before freeing them.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>

1 files changed, 38 insertions, 37 deletions

diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 5cc464a17c93..04142caedb2b 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -205,6 +205,35 @@ xlog_bread(
 }
 
 /*
+ * Read at an offset into the buffer. Returns with the buffer in it's original
+ * state regardless of the result of the read.
+ */
+STATIC int
+xlog_bread_offset(
+        xlog_t          *log,
+        xfs_daddr_t     blk_no,         /* block to read from */
+        int             nbblks,         /* blocks to read */
+        xfs_buf_t       *bp,
+        xfs_caddr_t     offset)
+{
+        xfs_caddr_t     orig_offset = XFS_BUF_PTR(bp);
+        int             orig_len = bp->b_buffer_length;
+        int             error, error2;
+
+        error = XFS_BUF_SET_PTR(bp, offset, BBTOB(nbblks));
+        if (error)
+                return error;
+
+        error = xlog_bread_noalign(log, blk_no, nbblks, bp);
+
+        /* must reset buffer pointer even on error */
+        error2 = XFS_BUF_SET_PTR(bp, orig_offset, orig_len);
+        if (error)
+                return error;
+        return error2;
+}
+
+/*
  * Write out the buffer at the given block for the given number of blocks.
  * The buffer is kept locked across the write and is returned locked.
  * This can only be used for synchronous log writes.
@@ -1229,20 +1258,12 @@ xlog_write_log_records(
                  */
                 ealign = round_down(end_block, sectbb);
                 if (j == 0 && (start_block + endcount > ealign)) {
-                        offset = XFS_BUF_PTR(bp);
-                        balign = BBTOB(ealign - start_block);
-                        error = XFS_BUF_SET_PTR(bp, offset + balign,
-                                                BBTOB(sectbb));
+                        offset = XFS_BUF_PTR(bp) + BBTOB(ealign - start_block);
+                        error = xlog_bread_offset(log, ealign, sectbb,
+                                                        bp, offset);
                         if (error)
                                 break;
 
-                        error = xlog_bread_noalign(log, ealign, sectbb, bp);
-                        if (error)
-                                break;
-
-                        error = XFS_BUF_SET_PTR(bp, offset, bufblks);
-                        if (error)
-                                break;
                 }
 
                 offset = xlog_align(log, start_block, endcount, bp);
@@ -3448,19 +3469,9 @@ xlog_do_recovery_pass(
                                  *   - order is important.
                                  */
                                 wrapped_hblks = hblks - split_hblks;
-                                error = XFS_BUF_SET_PTR(hbp,
-                                                offset + BBTOB(split_hblks),
-                                                BBTOB(hblks - split_hblks));
-                                if (error)
-                                        goto bread_err2;
-
-                                error = xlog_bread_noalign(log, 0,
-                                                           wrapped_hblks, hbp);
-                                if (error)
-                                        goto bread_err2;
-
-                                error = XFS_BUF_SET_PTR(hbp, offset,
-                                                        BBTOB(hblks));
+                                error = xlog_bread_offset(log, 0,
+                                                wrapped_hblks, hbp,
+                                                offset + BBTOB(split_hblks));
                                 if (error)
                                         goto bread_err2;
                         }
@@ -3511,19 +3522,9 @@ xlog_do_recovery_pass(
                                  *   _first_, then the log start (LR header end)
                                  *   - order is important.
                                  */
-                                error = XFS_BUF_SET_PTR(dbp,
-                                                offset + BBTOB(split_bblks),
-                                                BBTOB(bblks - split_bblks));
-                                if (error)
-                                        goto bread_err2;
-
-                                error = xlog_bread_noalign(log, wrapped_hblks,
-                                                bblks - split_bblks,
-                                                dbp);
-                                if (error)
-                                        goto bread_err2;
-
-                                error = XFS_BUF_SET_PTR(dbp, offset, h_size);
+                                error = xlog_bread_offset(log, 0,
+                                                bblks - split_bblks, hbp,
+                                                offset + BBTOB(split_bblks));
                                 if (error)
                                         goto bread_err2;
                         }