Merge JFFS2 updates from David Woodhouse

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/jffs2/scan.c b/fs/jffs2/scan.c
index 7654e87b0428..9ad5ba4b299b 100644
--- a/fs/jffs2/scan.c
+++ b/fs/jffs2/scan.c
@@ -510,6 +510,10 @@ static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblo
                                 sumlen = c->sector_size - je32_to_cpu(sm->offset);
                                 sumptr = buf + buf_size - sumlen;
 
+                                /* sm->offset maybe wrong but MAGIC maybe right */
+                                if (sumlen > c->sector_size)
+                                        goto full_scan;
+
                                 /* Now, make sure the summary itself is available */
                                 if (sumlen > buf_size) {
                                         /* Need to kmalloc for this. */
@@ -544,6 +548,7 @@ static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblo
                 }
         }
 
+full_scan:
         buf_ofs = jeb->offset;
 
         if (!buf_size) {