The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable@xxxxxxxxxxxxxxx>. Possible dependencies: <!DOCTYPE html> <html lang='en'> <head> <title>kernel/git/sashal/deps.git - Sashas dependency resolver</title> <meta name='generator' content='cgit '/> <meta name='robots' content='noindex, nofollow'/> <link rel='stylesheet' type='text/css' href='/cgit-data/cgit.css'/> <link rel='shortcut icon' href='/favicon.ico'/> <link rel='alternate' title='Atom feed' href='http://git.kernel.org/pub/scm/linux/kernel/git/sashal/deps.git/atom/?h=master' type='application/atom+xml'/> <link rel='vcs-git' href='git://git.kernel.org/pub/scm/linux/kernel/git/sashal/deps.git' title='kernel/git/sashal/deps.git Git repository'/> <link rel='vcs-git' href='https://git.kernel.org/pub/scm/linux/kernel/git/sashal/deps.git' title='kernel/git/sashal/deps.git Git repository'/> <link rel='vcs-git' href='https://kernel.googlesource.com/pub/scm/linux/kernel/git/sashal/deps.git' title='kernel/git/sashal/deps.git Git repository'/> </head> <body> <div id='cgit'><table id='header'> <tr> <td class='logo' rowspan='2'><a href='/'><img src='/cgit-data/cgit.png' alt='cgit logo'/></a></td> <td class='main'><a href='/'>index</a> : <a title='kernel/git/sashal/deps.git' href='/pub/scm/linux/kernel/git/sashal/deps.git/'>kernel/git/sashal/deps.git</a></td><td class='form'><form method='get'> <select name='h' onchange='this.form.submit();'> <option value='master' selected='selected'>master</option> </select> <input type='submit' value='switch'/></form></td></tr> <tr><td class='sub'>Sashas dependency resolver</td><td class='sub right'>Sasha Levin</td></tr></table> <table class='tabs'><tr><td> <a href='/pub/scm/linux/kernel/git/sashal/deps.git/'>summary</a><a href='/pub/scm/linux/kernel/git/sashal/deps.git/refs/'>refs</a><a href='/pub/scm/linux/kernel/git/sashal/deps.git/log/'>log</a><a href='/pub/scm/linux/kernel/git/sashal/deps.git/tree/'>tree</a><a href='/pub/scm/linux/kernel/git/sashal/deps.git/commit/'>commit</a><a href='/pub/scm/linux/kernel/git/sashal/deps.git/diff/'>diff</a><a href='/pub/scm/linux/kernel/git/sashal/deps.git/stats/'>stats</a></td><td class='form'><form class='right' method='get' action='/pub/scm/linux/kernel/git/sashal/deps.git/log/'> <select name='qt'> <option value='grep'>log msg</option> <option value='author'>author</option> <option value='committer'>committer</option> <option value='range'>range</option> </select> <input class='txt' type='search' size='10' name='q' value=''/> <input type='submit' value='search'/> </form> </td></tr></table> <div class='content'><div class='error'>Not found</div> </div> <!-- class=content --> <div class='footer'>generated by <a href='https://git.zx2c4.com/cgit/about/'>cgit </a> (<a href='https://git-scm.com/'>git 2.34.1</a>) at 2022-10-12 20:35:28 +0000</div> </div> <!-- id=cgit --> </body> </html> thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From d325dc6eb763c10f591c239550b8c7e5466a5d09 Mon Sep 17 00:00:00 2001 From: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx> Date: Tue, 4 Oct 2022 00:05:19 +0900 Subject: [PATCH] nilfs2: fix use-after-free bug of struct nilfs_root If the beginning of the inode bitmap area is corrupted on disk, an inode with the same inode number as the root inode can be allocated and fail soon after. In this case, the subsequent call to nilfs_clear_inode() on that bogus root inode will wrongly decrement the reference counter of struct nilfs_root, and this will erroneously free struct nilfs_root, causing kernel oopses. This fixes the problem by changing nilfs_new_inode() to skip reserved inode numbers while repairing the inode bitmap. Link: https://lkml.kernel.org/r/20221003150519.39789-1-konishi.ryusuke@xxxxxxxxx Signed-off-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx> Reported-by: syzbot+b8c672b0e22615c80fe0@xxxxxxxxxxxxxxxxxxxxxxxxx Reported-by: Khalid Masum <khalid.masum.92@xxxxxxxxx> Tested-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c index 67f63cfeade5..b074144f6f83 100644 --- a/fs/nilfs2/inode.c +++ b/fs/nilfs2/inode.c @@ -328,6 +328,7 @@ struct inode *nilfs_new_inode(struct inode *dir, umode_t mode) struct inode *inode; struct nilfs_inode_info *ii; struct nilfs_root *root; + struct buffer_head *bh; int err = -ENOMEM; ino_t ino; @@ -343,11 +344,25 @@ struct inode *nilfs_new_inode(struct inode *dir, umode_t mode) ii->i_state = BIT(NILFS_I_NEW); ii->i_root = root; - err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh); + err = nilfs_ifile_create_inode(root->ifile, &ino, &bh); if (unlikely(err)) goto failed_ifile_create_inode; /* reference count of i_bh inherits from nilfs_mdt_read_block() */ + if (unlikely(ino < NILFS_USER_INO)) { + nilfs_warn(sb, + "inode bitmap is inconsistent for reserved inodes"); + do { + brelse(bh); + err = nilfs_ifile_create_inode(root->ifile, &ino, &bh); + if (unlikely(err)) + goto failed_ifile_create_inode; + } while (ino < NILFS_USER_INO); + + nilfs_info(sb, "repaired inode bitmap for reserved inodes"); + } + ii->i_bh = bh; + atomic64_inc(&root->inodes_count); inode_init_owner(&init_user_ns, inode, dir, mode); inode->i_ino = ino;
