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pidfs: fix pidfs_free_pid()

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Ensure that we handle the case where task creation fails and pid->attr
was never accessed at all.

Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner
2025-06-23 14:50:30 +02:00
parent 4e3d1e6e1b
commit f077638b5f
1 changed files with 10 additions and 8 deletions
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18
fs/pidfs.c
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@@ -150,18 +150,20 @@ void pidfs_free_pid(struct pid *pid)
*/
VFS_WARN_ON_ONCE(pid->stashed);
/*
* This if an error occurred during e.g., task creation that
* causes us to never go through the exit path.
*/
if (unlikely(!attr))
return;
/* This never had a pidfd created. */
if (IS_ERR(attr))
return;
/*
* Any dentry must've been wiped from the pid by now. Otherwise
* there's a reference count bug.
*/
VFS_WARN_ON_ONCE(pid->stashed);
xattrs = attr->xattrs;
xattrs = no_free_ptr(attr->xattrs);
if (xattrs)
simple_xattrs_free(attr->xattrs, NULL);
simple_xattrs_free(xattrs, NULL);
}
#ifdef CONFIG_PROC_FS