From 2be8b5cee9e9a73add9195901c0f680755de0022 Mon Sep 17 00:00:00 2001
From: yangsheng <yangsheng>
Date: Fri, 31 Oct 2008 07:59:50 +0000
Subject: [PATCH] Branch HEAD b=17379 i=Brian(LLNL), johann
Set recursive symlink depth to 5 when kernel has 4K stack.
---
lustre/llite/symlink.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/lustre/llite/symlink.c b/lustre/llite/symlink.c
index 5b2fe077ec..918e2e9b5b 100644
--- a/lustre/llite/symlink.c
+++ b/lustre/llite/symlink.c
@@ -165,10 +165,22 @@ static LL_FOLLOW_LINK_RETURN_TYPE ll_follow_link(struct dentry *dentry,
#endif
CDEBUG(D_VFSTRACE, "VFS Op\n");
+#if THREAD_SIZE < 8192
+ /*
+ * We set the limits recursive symlink to 5
+ * instead of default 8 when kernel has 4k stack
+ * to prevent stack overflow.
+ */
+ if (current->link_count >= 5) {
+ rc = -ELOOP;
+ GOTO(out_release, rc);
+ }
+#endif
down(&lli->lli_size_sem);
rc = ll_readlink_internal(inode, &request, &symname);
up(&lli->lli_size_sem);
if (rc) {
+out_release:
path_release(nd); /* Kernel assumes that ->follow_link()
releases nameidata on error */
GOTO(out, rc);
--
GitLab