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autofs-5.1.8 - fix incorrect path for is_mounted() in try_remount()
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From: Ian Kent <raven@themaw.net>
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A regression was introduced when the offset mount handling was rewritten.
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It resulted in an incorrect path sometimes being used in an is_mounted()
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check.
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Signed-off-by: Ian Kent <raven@themaw.net>
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---
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CHANGELOG | 1 +
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lib/mounts.c | 26 +++++++++++++++++++++-----
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2 files changed, 22 insertions(+), 5 deletions(-)
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--- autofs-5.1.7.orig/CHANGELOG
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+++ autofs-5.1.7/CHANGELOG
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@@ -111,6 +111,7 @@
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- fix deadlock with hosts map reload.
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- fix memory leak in update_hosts_mounts().
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- fix minus only option handling in concat_options().
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+- fix incorrect path for is_mounted() in try_remount().
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25/01/2021 autofs-5.1.7
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- make bind mounts propagation slave by default.
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--- autofs-5.1.7.orig/lib/mounts.c
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+++ autofs-5.1.7/lib/mounts.c
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@@ -2803,14 +2803,30 @@ int try_remount(struct autofs_point *ap,
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ap->flags &= ~MOUNT_FLAG_DIR_CREATED;
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else
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ap->flags |= MOUNT_FLAG_DIR_CREATED;
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+ goto done;
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+ }
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+
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+ me->flags &= ~MOUNT_FLAG_DIR_CREATED;
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+ /* Direct or offset mount, key is full path */
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+ if (MM_PARENT(me)->key[0] == '/') {
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+ if (!is_mounted(MM_PARENT(me)->key, MNTS_REAL))
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+ me->flags |= MOUNT_FLAG_DIR_CREATED;
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} else {
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- me->flags &= ~MOUNT_FLAG_DIR_CREATED;
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- if (type == t_offset) {
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- if (!is_mounted(MM_PARENT(me)->key, MNTS_REAL))
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- me->flags |= MOUNT_FLAG_DIR_CREATED;
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+ char *p_key = MM_PARENT(me)->key;
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+ char mp[PATH_MAX + 1];
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+ int len;
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+
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+ len = mount_fullpath(mp, PATH_MAX, ap->path, ap->len, p_key);
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+ if (len > PATH_MAX) {
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+ /* This should never happen due to earlier checks */
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+ error(ap->logopt, "mountpoint path too long");
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+ return 0;
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}
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- }
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+ if (!is_mounted(mp, MNTS_REAL))
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+ me->flags |= MOUNT_FLAG_DIR_CREATED;
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+ }
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+done:
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/*
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* Either we opened the mount or we're re-reading the map.
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* If we opened the mount and ioctlfd is not -1 we have
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