141 lines
4.1 KiB
Diff
141 lines
4.1 KiB
Diff
From dd0c8768be8605040100cf8260f6b1405c264ffe Mon Sep 17 00:00:00 2001
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From: root <root@localhost.localdomain>
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Date: Fri, 22 Mar 2019 19:48:35 +0800
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Subject: [PATCH] clear mpp path reference when path is freed, otherwise double
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free may occur in verify_paths.
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call stack:
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vecs=vecs@entry=0x557b01d62140, rpvec=rpvec@entry=0x0) at structs_vec.c:521
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at main.c:574
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uev=<optimized out>) at main.c:510
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uev_trigger=uev_trigger@entry=0x557affdfe3d0 <uev_trigger>, trigger_data=<optimized out>)
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at uevent.c:178
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---
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libmultipath/discovery.c | 10 ++++++----
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libmultipath/discovery.h | 2 +-
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multipathd/main.c | 24 +++++++++++++++++++++++-
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3 files changed, 30 insertions(+), 6 deletions(-)
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diff --git a/libmultipath/discovery.c b/libmultipath/discovery.c
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index 24e9b50..b5cbc88 100644
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--- a/libmultipath/discovery.c
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+++ b/libmultipath/discovery.c
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@@ -114,7 +114,7 @@ transport (int h)
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}
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int
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-remove_local_path (vector pathvec, struct path *pp)
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+remove_local_path (vector pathvec, struct path *pp, int isfree)
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{
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int i = -1;
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@@ -129,7 +129,9 @@ remove_local_path (vector pathvec, struct path *pp)
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if ((i = find_slot(pathvec, (void *)pp)) != -1) {
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vector_del_slot(pathvec, i);
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}
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- free_path(pp);
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+ if(isfree){
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+ free_path(pp);
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+ }
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return 0;
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}
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@@ -237,7 +239,7 @@ path_discover (vector pathvec, struct config * conf,
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if (err == 1)
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return 1;
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if (err == 0)
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- remove_local_path(pathvec, pp);
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+ remove_local_path(pathvec, pp, 1);
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return 0;
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}
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else {
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@@ -250,7 +252,7 @@ path_discover (vector pathvec, struct config * conf,
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if (err)
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return err;
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- remove_local_path(pathvec, pp);
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+ remove_local_path(pathvec, pp, 1);
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return err;
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}
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}
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diff --git a/libmultipath/discovery.h b/libmultipath/discovery.h
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index a438b44..ab73493 100644
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--- a/libmultipath/discovery.h
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+++ b/libmultipath/discovery.h
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@@ -56,7 +56,7 @@ int sysfs_get_asymmetric_access_state(struct path *pp,
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char *buff, int buflen);
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int get_uid(struct path * pp, int path_state, struct udev_device *udev,
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int allow_fallback);
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-int remove_local_path(vector pathvec, struct path *pp);
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+int remove_local_path(vector pathvec, struct path *pp, int isfree);
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/*
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* discovery bitmask
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diff --git a/multipathd/main.c b/multipathd/main.c
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index 0b572ee..a10eba0 100644
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--- a/multipathd/main.c
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+++ b/multipathd/main.c
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@@ -813,6 +813,21 @@ ev_remove_map (char * devname, char * alias, int minor, struct vectors * vecs)
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return flush_map(mpp, vecs, 0);
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}
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+static
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+void clear_ref_from_mpp(struct path * pp, struct vectors * vecs)
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+{
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+ struct multipath * mpp = NULL;
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+ int i = -1;
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+
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+ mpp = find_mp_by_wwid(vecs->mpvec, pp->wwid);
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+ if(!!mpp){
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+ condlog(2, "%s: clear path from mpp %s", pp->dev, mpp->alias);
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+ if ((i = find_slot(mpp->paths, (void *)pp)) != -1){
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+ vector_del_slot(mpp->paths, i);
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+ }
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+ }
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+}
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+
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static int
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uev_add_path (struct uevent *uev, struct vectors * vecs, int need_do_map)
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{
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@@ -904,6 +919,7 @@ uev_add_path (struct uevent *uev, struct vectors * vecs, int need_do_map)
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i = find_slot(vecs->pathvec, (void *)pp);
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if (i != -1)
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vector_del_slot(vecs->pathvec, i);
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+ clear_ref_from_mpp(pp, vecs);
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free_path(pp);
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} else {
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condlog(0, "%s: failed to reinitialize path",
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@@ -965,8 +981,11 @@ ev_add_path (struct path * pp, struct vectors * vecs, int need_do_map)
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int ret;
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/* if pp is local path,remove it and return 0. */
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- if (!remove_local_path(vecs->pathvec, pp))
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+ if (!remove_local_path(vecs->pathvec, pp, 0)){
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+ clear_ref_from_mpp(pp, vecs);
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+ free_path(pp);
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return 0;
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+ }
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/*
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* need path UID to go any further
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@@ -981,6 +1000,7 @@ ev_add_path (struct path * pp, struct vectors * vecs, int need_do_map)
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int i = find_slot(vecs->pathvec, (void *)pp);
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if (i != -1)
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vector_del_slot(vecs->pathvec, i);
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+ clear_ref_from_mpp(pp, vecs);
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free_path(pp);
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return 1;
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}
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@@ -1242,6 +1262,8 @@ ev_remove_path (struct path *pp, struct vectors * vecs, int need_do_map)
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/* mpp == NULL */
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if ((i = find_slot(vecs->pathvec, (void *)pp)) != -1)
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vector_del_slot(vecs->pathvec, i);
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+
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+ clear_ref_from_mpp(pp, vecs);
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free_path(pp);
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}
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out:
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--
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1.8.3.1
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