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ubifs: skip dumping tnc tree when zroot is null 

Clearing slab cache will free all znode in memory and make
c->zroot.znode = NULL, then dumping tnc tree will access
c->zroot.znode which cause null pointer dereference.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=219624#c0
Fixes: 1e51764a3c ("UBIFS: add new flash file system")
Signed-off-by: pangliyuan <pangliyuan1@huawei.com>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
pangliyuan 2024-12-24 16:18:23 +08:00 committed by Richard Weinberger
parent 844c6fdc13
commit bdb0ca39e0
1 changed files with 13 additions and 9 deletions
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22
fs/ubifs/debug.c
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@ -945,16 +945,20 @@ void ubifs_dump_tnc(struct ubifs_info *c)
pr_err("\n");
pr_err("(pid %d) start dumping TNC tree\n", current->pid);
znode = ubifs_tnc_levelorder_next(c, c->zroot.znode, NULL);
level = znode->level;
pr_err("== Level %d ==\n", level);
while (znode) {
if (level != znode->level) {
level = znode->level;
pr_err("== Level %d ==\n", level);
if (c->zroot.znode) {
znode = ubifs_tnc_levelorder_next(c, c->zroot.znode, NULL);
level = znode->level;
pr_err("== Level %d ==\n", level);
while (znode) {
if (level != znode->level) {
level = znode->level;
pr_err("== Level %d ==\n", level);
}
ubifs_dump_znode(c, znode);
znode = ubifs_tnc_levelorder_next(c, c->zroot.znode, znode);
}
ubifs_dump_znode(c, znode);
znode = ubifs_tnc_levelorder_next(c, c->zroot.znode, znode);
} else {
pr_err("empty TNC tree in memory\n");
}
pr_err("(pid %d) finish dumping TNC tree\n", current->pid);
}