[PATCH 2/4] UBIFS: fix oops in lprops dump function

[Artem Bityutskiy]

From: Artem Bityutskiy <Artem.Bityutskiy at nokia.com>

The 'dbg_dump_lprop()' is trying to detect journal head LEBs when printing,
so it looks at the write-buffers. However, if we are in R/O mode, we
de-allocate the write-buffers, so 'dbg_dump_lprop()' oopses. This patch fixes
the issue.

Note, this patch is not critical, it is only about the debugging code path, and
it is unlikely that anyone but UBIFS developers would ever hit this issue.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy at nokia.com>
---
 fs/ubifs/debug.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c
index 1c5852a..063bc2b 100644
--- a/fs/ubifs/debug.c
+++ b/fs/ubifs/debug.c
@@ -746,7 +746,13 @@ void dbg_dump_lprop(const struct ubifs_info *c, const struct ubifs_lprops *lp)
 		if (bud->lnum == lp->lnum) {
 			int head = 0;
 			for (i = 0; i < c->jhead_cnt; i++) {
-				if (lp->lnum == c->jheads[i].wbuf.lnum) {
+				/*
+				 * Note, if we are in R/O mode or in the middle
+				 * of mounting/re-mounting, the write-buffers do
+				 * not exist.
+				 */
+				if (c->jheads &&
+				    lp->lnum == c->jheads[i].wbuf.lnum) {
 					printk(KERN_CONT ", jhead %s",
 					       dbg_jhead(i));
 					head = 1;
-- 
1.7.2.3