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susfs: fix try_umount path reference lifetime

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This commit is contained in:
Nicholas Andrew 2026-09-19 00:45:44 -04:00
commit 676d5d17df
1 changed files with 12 additions and 2 deletions
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14
fs/susfs.c
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@ -1172,8 +1172,13 @@ int susfs_sus_memfd(char *memfd_name) {
static void umount_mnt(struct path *path, int flags) {
int err = path_umount(path, flags);
/*
* path_umount() consumes the path references, so do not
* dereference path after it returns.
*/
if (err) {
SUSFS_LOGI("umount %s failed: %d\n", path->dentry->d_iname, err);
SUSFS_LOGI("umount failed: %d\n", err);
}
}
@ -1206,14 +1211,19 @@ static void try_umount(const char *mnt, bool check_mnt, int flags) {
if (path.dentry != path.mnt->mnt_root) {
// it is not root mountpoint, maybe umounted by others already.
path_put(&path);
return;
}
// we are only interest in some specific mounts
if (check_mnt && !should_umount(&path)) {
path_put(&path);
return;
}
/*
* Successful handoff: path_umount() consumes these references.
*/
umount_mnt(&path, flags);
}