jffs2: fix unbalanced locking

Li Zefan reported an unbalanced locking issue, found by his
internal debugging feature on runtime. The particular case he was
looking at doesn't lead to a deadlock, as the structure that this lock
is embedded in is freed on error. But we should straighten out the error
handling.

Because several callers of jffs2_do_read_inode_internal() /
jffs2_do_read_inode() already handle the locking/unlocking and inode
clearing at their own level, let's just push any unlocks/clearing down
to the caller. This consistency is much easier to verify.

Reported-by: Li Zefan <lizefan@huawei.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

diff --git a/fs/jffs2/fs.c b/fs/jffs2/fs.c
index fe5ea08..4cff0d5 100644 (file)
--- a/fs/jffs2/fs.c
+++ b/fs/jffs2/fs.c
@@ -272,12 +272,9 @@ struct inode *jffs2_iget(struct super_block *sb, unsigned long ino)
        mutex_lock(&f->sem);
 
        ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node);
+       if (ret)
+               goto error;
 
-       if (ret) {
-               mutex_unlock(&f->sem);
-               iget_failed(inode);
-               return ERR_PTR(ret);
-       }
        inode->i_mode = jemode_to_cpu(latest_node.mode);
        i_uid_write(inode, je16_to_cpu(latest_node.uid));
        i_gid_write(inode, je16_to_cpu(latest_node.gid));

diff --git a/fs/jffs2/readinode.c b/fs/jffs2/readinode.c
index dddbde4..28e0aab 100644 (file)
--- a/fs/jffs2/readinode.c
+++ b/fs/jffs2/readinode.c
@@ -1203,17 +1203,13 @@ static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c,
                JFFS2_ERROR("failed to read from flash: error %d, %zd of %zd bytes read\n",
                        ret, retlen, sizeof(*latest_node));
                /* FIXME: If this fails, there seems to be a memory leak. Find it. */
-               mutex_unlock(&f->sem);
-               jffs2_do_clear_inode(c, f);
-               return ret?ret:-EIO;
+               return ret ? ret : -EIO;
        }
 
        crc = crc32(0, latest_node, sizeof(*latest_node)-8);
        if (crc != je32_to_cpu(latest_node->node_crc)) {
                JFFS2_ERROR("CRC failed for read_inode of inode %u at physical location 0x%x\n",
                        f->inocache->ino, ref_offset(rii.latest_ref));
-               mutex_unlock(&f->sem);
-               jffs2_do_clear_inode(c, f);
                return -EIO;
        }
 
@@ -1250,16 +1246,11 @@ static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c,
                         * keep in RAM to facilitate quick follow symlink
                         * operation. */
                        uint32_t csize = je32_to_cpu(latest_node->csize);
-                       if (csize > JFFS2_MAX_NAME_LEN) {
-                               mutex_unlock(&f->sem);
-                               jffs2_do_clear_inode(c, f);
+                       if (csize > JFFS2_MAX_NAME_LEN)
                                return -ENAMETOOLONG;
-                       }
                        f->target = kmalloc(csize + 1, GFP_KERNEL);
                        if (!f->target) {
                                JFFS2_ERROR("can't allocate %u bytes of memory for the symlink target path cache\n", csize);
-                               mutex_unlock(&f->sem);
-                               jffs2_do_clear_inode(c, f);
                                return -ENOMEM;
                        }
 
@@ -1271,8 +1262,6 @@ static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c,
                                        ret = -EIO;
                                kfree(f->target);
                                f->target = NULL;
-                               mutex_unlock(&f->sem);
-                               jffs2_do_clear_inode(c, f);
                                return ret;
                        }
 
@@ -1289,15 +1278,11 @@ static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c,
                if (f->metadata) {
                        JFFS2_ERROR("Argh. Special inode #%u with mode 0%o had metadata node\n",
                               f->inocache->ino, jemode_to_cpu(latest_node->mode));
-                       mutex_unlock(&f->sem);
-                       jffs2_do_clear_inode(c, f);
                        return -EIO;
                }
                if (!frag_first(&f->fragtree)) {
                        JFFS2_ERROR("Argh. Special inode #%u with mode 0%o has no fragments\n",
                               f->inocache->ino, jemode_to_cpu(latest_node->mode));
-                       mutex_unlock(&f->sem);
-                       jffs2_do_clear_inode(c, f);
                        return -EIO;
                }
                /* ASSERT: f->fraglist != NULL */
@@ -1305,8 +1290,6 @@ static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c,
                        JFFS2_ERROR("Argh. Special inode #%u with mode 0x%x had more than one node\n",
                               f->inocache->ino, jemode_to_cpu(latest_node->mode));
                        /* FIXME: Deal with it - check crc32, check for duplicate node, check times and discard the older one */
-                       mutex_unlock(&f->sem);
-                       jffs2_do_clear_inode(c, f);
                        return -EIO;
                }
                /* OK. We're happy */
@@ -1400,10 +1383,8 @@ int jffs2_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *i
        f->inocache = ic;
 
        ret = jffs2_do_read_inode_internal(c, f, &n);
-       if (!ret) {
-               mutex_unlock(&f->sem);
-               jffs2_do_clear_inode(c, f);
-       }
+       mutex_unlock(&f->sem);
+       jffs2_do_clear_inode(c, f);
        jffs2_xattr_do_crccheck_inode(c, ic);
        kfree (f);
        return ret;