From 25601a3c9737fed554169759582c690b98ead5d4 Mon Sep 17 00:00:00 2001 From: hujianyang Date: Wed, 30 Jul 2014 10:37:53 +0800 Subject: [PATCH] UBIFS: Add log overlap assertions We use a circle area to record the log nodes in ubifs. This log area should not be overlapped. But after researching the code, I found some conditions may lead log head wraps log ltail. Although we've fixed the problems discovered, there may be some other issues still left. This patch adds assertions where lhead changes to next leb to make sure ltail is not wrapped. Signed-off-by: hujianyang Signed-off-by: Artem Bityutskiy --- fs/ubifs/log.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/ubifs/log.c b/fs/ubifs/log.c index 518b13685b2a..a47ddfc9be6b 100644 --- a/fs/ubifs/log.c +++ b/fs/ubifs/log.c @@ -240,6 +240,7 @@ int ubifs_add_bud_to_log(struct ubifs_info *c, int jhead, int lnum, int offs) if (c->lhead_offs > c->leb_size - c->ref_node_alsz) { c->lhead_lnum = ubifs_next_log_lnum(c, c->lhead_lnum); + ubifs_assert(c->lhead_lnum != c->ltail_lnum); c->lhead_offs = 0; } @@ -404,6 +405,7 @@ int ubifs_log_start_commit(struct ubifs_info *c, int *ltail_lnum) /* Switch to the next log LEB */ if (c->lhead_offs) { c->lhead_lnum = ubifs_next_log_lnum(c, c->lhead_lnum); + ubifs_assert(c->lhead_lnum != c->ltail_lnum); c->lhead_offs = 0; } -- 2.20.1