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autofs-5.1.6 - fix program map multi-mount lookup after mount fail
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From: Ian Kent <raven@themaw.net>
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For the case of a singleton multi-mount program map lookup following
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a mount fail (and the negative timeout has passed) the lookup key is
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what's expected for an indirect map key but the the root offset map
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entry already exists. This causes autofs to think it has an incorrect
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lookup key and it fails the lookup when it should take the opptunity
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to delete and update the cache entry since it's not actually in use
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yet.
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If a check is done to see if the lookup is for the root offset,
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deleting the entry fails because it contains an offset. Later when
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parsing is done the offset will get updated and can get out of sync
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with the entry of the multi-mount owner. That's not a problem as the
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offsets would be deleted on eventual expire but it's best to clean
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out the entry and start a fresh so the most up to date map entry
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is being used.
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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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modules/lookup_program.c | 7 +++++--
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2 files changed, 6 insertions(+), 2 deletions(-)
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--- autofs-5.1.4.orig/CHANGELOG
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+++ autofs-5.1.4/CHANGELOG
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@@ -27,6 +27,7 @@
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- rename path to m_offset in update_offset_entry().
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- don't pass root to do_mount_autofs_offset().
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- rename tree implementation functions.
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+- fix program map multi-mount lookup after mount fail.
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xx/xx/2018 autofs-5.1.5
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- fix flag file permission.
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--- autofs-5.1.4.orig/modules/lookup_program.c
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+++ autofs-5.1.4/modules/lookup_program.c
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@@ -664,7 +664,7 @@ int lookup_mount(struct autofs_point *ap
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name_len, ent, ctxt->parse->context);
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goto out_free;
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} else {
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- if (me->multi) {
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+ if (me->multi && me->multi != me) {
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cache_unlock(mc);
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warn(ap->logopt, MODPREFIX
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"unexpected lookup for active multi-mount"
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@@ -674,8 +674,11 @@ int lookup_mount(struct autofs_point *ap
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cache_unlock(mc);
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cache_writelock(mc);
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me = cache_lookup_distinct(mc, name);
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- if (me)
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+ if (me) {
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+ if (me->multi)
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+ cache_delete_offset_list(mc, name);
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cache_delete(mc, name);
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+ }
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cache_unlock(mc);
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}
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}
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