From: Lai Siyao <lai.siyao@whamcloud.com>
Date: Sun, 27 Sep 2020 06:36:57 +0000 (+0800)
Subject: LU-14004 llite: default lsm update may memory leak
X-Git-Tag: 2.14.52~53
X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=commitdiff_plain;h=cd2ad336177f8f3130de264709dc326349a22b23

LU-14004 llite: default lsm update may memory leak

ll_update_default_lsm_md() should check whether lli_default_lsm_md
is set before setting it to the data from lustre_md, and if it's set,
release the old data to avoid memory leak.

Signed-off-by: Lai Siyao <lai.siyao@whamcloud.com>
Change-Id: I9c8434c5d62f9fb751788031d6769fd49427c371
Reviewed-on: https://review.whamcloud.com/40103
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
---

diff --git a/lustre/llite/llite_lib.c b/lustre/llite/llite_lib.c
index 2b0bd62..62a3faa 100644
--- a/lustre/llite/llite_lib.c
+++ b/lustre/llite/llite_lib.c
@@ -1588,30 +1588,27 @@ static void ll_update_default_lsm_md(struct inode *inode, struct lustre_md *md)
 			}
 			up_write(&lli->lli_lsm_sem);
 		}
-	} else if (lli->lli_default_lsm_md) {
-		/* update default lsm if it changes */
+		return;
+	}
+
+	if (lli->lli_default_lsm_md) {
+		/* do nonthing if default lsm isn't changed */
 		down_read(&lli->lli_lsm_sem);
 		if (lli->lli_default_lsm_md &&
-		    !lsm_md_eq(lli->lli_default_lsm_md, md->default_lmv)) {
-			up_read(&lli->lli_lsm_sem);
-			down_write(&lli->lli_lsm_sem);
-			if (lli->lli_default_lsm_md)
-				lmv_free_memmd(lli->lli_default_lsm_md);
-			lli->lli_default_lsm_md = md->default_lmv;
-			lsm_md_dump(D_INODE, md->default_lmv);
-			md->default_lmv = NULL;
-			up_write(&lli->lli_lsm_sem);
-		} else {
+		    lsm_md_eq(lli->lli_default_lsm_md, md->default_lmv)) {
 			up_read(&lli->lli_lsm_sem);
+			return;
 		}
-	} else {
-		/* init default lsm */
-		down_write(&lli->lli_lsm_sem);
-		lli->lli_default_lsm_md = md->default_lmv;
-		lsm_md_dump(D_INODE, md->default_lmv);
-		md->default_lmv = NULL;
-		up_write(&lli->lli_lsm_sem);
+		up_read(&lli->lli_lsm_sem);
 	}
+
+	down_write(&lli->lli_lsm_sem);
+	if (lli->lli_default_lsm_md)
+		lmv_free_memmd(lli->lli_default_lsm_md);
+	lli->lli_default_lsm_md = md->default_lmv;
+	lsm_md_dump(D_INODE, md->default_lmv);
+	md->default_lmv = NULL;
+	up_write(&lli->lli_lsm_sem);
 }
 
 static int ll_update_lsm_md(struct inode *inode, struct lustre_md *md)