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overlayfs fixes for 6.7-rc7

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Merge tag 'ovl-fixes-6.7-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs

Pull overlayfs fix from Amir Goldstein:
 "Fix a regression from this merge window"

* tag 'ovl-fixes-6.7-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs:
  ovl: fix dentry reference leak after changes to underlying layers
This commit is contained in:
Linus Torvalds 2023-12-20 12:04:03 -08:00
parent 74d8fc2b86 413ba91089
commit 1a44b0073b
1 changed files with 3 additions and 2 deletions
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5
fs/overlayfs/copy_up.c
View file

@ -753,15 +753,16 @@ static int ovl_copy_up_workdir(struct ovl_copy_up_ctx *c)
path.dentry = temp;
err = ovl_copy_up_data(c, &path);
/*
* We cannot hold lock_rename() throughout this helper, because or
* We cannot hold lock_rename() throughout this helper, because of
* lock ordering with sb_writers, which shouldn't be held when calling
* ovl_copy_up_data(), so lock workdir and destdir and make sure that
* temp wasn't moved before copy up completion or cleanup.
* If temp was moved, abort without the cleanup.
*/
ovl_start_write(c->dentry);
if (lock_rename(c->workdir, c->destdir) != NULL ||
temp->d_parent != c->workdir) {
/* temp or workdir moved underneath us? abort without cleanup */
dput(temp);
err = -EIO;
goto unlock;
} else if (err) {