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smb: client: handle DFS tcons in cifs_construct_tcon()
commit 4a5ba0e0bf
upstream.
The tcons created by cifs_construct_tcon() on multiuser mounts must
also be able to failover and refresh DFS referrals, so set the
appropriate fields in order to get a full DFS tcon. They could be
shared among different superblocks later, too.
Cc: stable@vger.kernel.org # 6.4+
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202404021518.3Xu2VU4s-lkp@intel.com/
Signed-off-by: Paulo Alcantara (Red Hat) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
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commit
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1 changed files with 30 additions and 0 deletions
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@ -3988,6 +3988,7 @@ cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
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struct cifs_ses *ses;
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struct cifs_tcon *tcon = NULL;
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struct smb3_fs_context *ctx;
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char *origin_fullpath = NULL;
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ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
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if (ctx == NULL)
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@ -4011,6 +4012,7 @@ cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
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ctx->sign = master_tcon->ses->sign;
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ctx->seal = master_tcon->seal;
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ctx->witness = master_tcon->use_witness;
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ctx->dfs_root_ses = master_tcon->ses->dfs_root_ses;
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rc = cifs_set_vol_auth(ctx, master_tcon->ses);
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if (rc) {
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@ -4030,12 +4032,39 @@ cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
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goto out;
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}
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#ifdef CONFIG_CIFS_DFS_UPCALL
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spin_lock(&master_tcon->tc_lock);
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if (master_tcon->origin_fullpath) {
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spin_unlock(&master_tcon->tc_lock);
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origin_fullpath = dfs_get_path(cifs_sb, cifs_sb->ctx->source);
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if (IS_ERR(origin_fullpath)) {
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tcon = ERR_CAST(origin_fullpath);
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origin_fullpath = NULL;
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cifs_put_smb_ses(ses);
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goto out;
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}
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} else {
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spin_unlock(&master_tcon->tc_lock);
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}
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#endif
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tcon = cifs_get_tcon(ses, ctx);
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if (IS_ERR(tcon)) {
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cifs_put_smb_ses(ses);
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goto out;
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}
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#ifdef CONFIG_CIFS_DFS_UPCALL
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if (origin_fullpath) {
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spin_lock(&tcon->tc_lock);
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tcon->origin_fullpath = origin_fullpath;
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spin_unlock(&tcon->tc_lock);
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origin_fullpath = NULL;
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queue_delayed_work(dfscache_wq, &tcon->dfs_cache_work,
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dfs_cache_get_ttl() * HZ);
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}
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#endif
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#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
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if (cap_unix(ses))
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reset_cifs_unix_caps(0, tcon, NULL, ctx);
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@ -4044,6 +4073,7 @@ cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
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out:
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kfree(ctx->username);
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kfree_sensitive(ctx->password);
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kfree(origin_fullpath);
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kfree(ctx);
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return tcon;
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