[PATCH] jffs2: avoid divide-by-zero

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/fs/jffs2/scan.c b/fs/jffs2/scan.c
index 3e51dd1..cf55b22 100644 (file)
--- a/fs/jffs2/scan.c
+++ b/fs/jffs2/scan.c
@@ -233,7 +233,7 @@ int jffs2_scan_medium(struct jffs2_sb_info *c)
                c->nextblock->dirty_size = 0;
        }
 #ifdef CONFIG_JFFS2_FS_WRITEBUFFER
-       if (!jffs2_can_mark_obsolete(c) && c->nextblock && (c->nextblock->free_size % c->wbuf_pagesize)) {
+       if (!jffs2_can_mark_obsolete(c) && c->wbuf_pagesize && c->nextblock && (c->nextblock->free_size % c->wbuf_pagesize)) {
                /* If we're going to start writing into a block which already
                   contains data, and the end of the data isn't page-aligned,
                   skip a little and align it. */