From: Allan Stephens Date: Thu, 5 Jun 2008 00:38:22 +0000 (-0700) Subject: tipc: Add missing spinlock in name table display code X-Git-Tag: v2.6.27-rc1~969^2~358 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=307fdf5e7defcacf84db21cda18770b2bf5f5196;p=linux-2.6 tipc: Add missing spinlock in name table display code This patch ensures that the display code that traverses the publication lists belonging to a name table entry take its associated spinlock, to protect against a possible change to one of its "head of list" pointers caused by a simultaneous name table lookup operation by another thread of control. Signed-off-by: Allan Stephens Signed-off-by: David S. Miller --- diff --git a/net/tipc/name_table.c b/net/tipc/name_table.c index 4455f13cfa..096f7bd240 100644 --- a/net/tipc/name_table.c +++ b/net/tipc/name_table.c @@ -74,7 +74,7 @@ struct sub_seq { * @first_free: array index of first unused sub-sequence entry * @ns_list: links to adjacent name sequences in hash chain * @subscriptions: list of subscriptions for this 'type' - * @lock: spinlock controlling access to name sequence structure + * @lock: spinlock controlling access to publication lists of all sub-sequences */ struct name_seq { @@ -918,7 +918,9 @@ static void nameseq_list(struct name_seq *seq, struct print_buf *buf, u32 depth, for (sseq = seq->sseqs; sseq != &seq->sseqs[seq->first_free]; sseq++) { if ((lowbound <= sseq->upper) && (upbound >= sseq->lower)) { tipc_printf(buf, "%s ", typearea); + spin_lock_bh(&seq->lock); subseq_list(sseq, buf, depth, index); + spin_unlock_bh(&seq->lock); sprintf(typearea, "%10s", " "); } }