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| author | Al Viro <[email protected]> | 2025-04-27 19:41:51 +0000 |
|---|---|---|
| committer | Al Viro <[email protected]> | 2025-05-09 22:02:12 +0000 |
| commit | 250cf3693060a5f803c5f1ddc082bb06b16112a9 (patch) | |
| tree | c884726453d713884f9b471b56f8e6d83974f482 /scripts/gcc-plugins/sancov_plugin.c | |
| parent | Linux 6.15-rc5 (diff) | |
| download | kernel-250cf3693060a5f803c5f1ddc082bb06b16112a9.tar.gz kernel-250cf3693060a5f803c5f1ddc082bb06b16112a9.zip | |
__legitimize_mnt(): check for MNT_SYNC_UMOUNT should be under mount_lock
... or we risk stealing final mntput from sync umount - raising mnt_count
after umount(2) has verified that victim is not busy, but before it
has set MNT_SYNC_UMOUNT; in that case __legitimize_mnt() doesn't see
that it's safe to quietly undo mnt_count increment and leaves dropping
the reference to caller, where it'll be a full-blown mntput().
Check under mount_lock is needed; leaving the current one done before
taking that makes no sense - it's nowhere near common enough to bother
with.
Reviewed-by: Christian Brauner <[email protected]>
Signed-off-by: Al Viro <[email protected]>
Diffstat (limited to 'scripts/gcc-plugins/sancov_plugin.c')
0 files changed, 0 insertions, 0 deletions