linux-kernel - [PATCH] fs: xfs: add NULL pointer check

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Date:   Mon, 28 Mar 2022 03:26:42 +0000
From:   cgel.zte@...il.com
To:     djwong@...nel.org
Cc:     linux-xfs@...r.kernel.org, dchinner@...hat.com,
        chandan.babu@...cle.com, bfoster@...hat.com,
        allison.henderson@...cle.com, lv.ruyi@....com.cn,
        linux-kernel@...r.kernel.org, Zeal Robot <zealci@....com.cn>
Subject: [PATCH] fs: xfs: add NULL pointer check

From: Lv Ruyi <lv.ruyi@....com.cn>

kmem_zalloc() is a memory allocation function which can return NULL when
some internal memory errors happen. It is safer to check NULL pointer.

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi@....com.cn>
---
 fs/xfs/libxfs/xfs_attr_leaf.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/xfs/libxfs/xfs_attr_leaf.c b/fs/xfs/libxfs/xfs_attr_leaf.c
index 014daa8c542d..e6694f49f563 100644
--- a/fs/xfs/libxfs/xfs_attr_leaf.c
+++ b/fs/xfs/libxfs/xfs_attr_leaf.c
@@ -1571,6 +1571,8 @@ xfs_attr3_leaf_compact(
 	trace_xfs_attr_leaf_compact(args);
 
 	tmpbuffer = kmem_alloc(args->geo->blksize, 0);
+	if (!tmpbuffer)
+		return;
 	memcpy(tmpbuffer, bp->b_addr, args->geo->blksize);
 	memset(bp->b_addr, 0, args->geo->blksize);
 	leaf_src = (xfs_attr_leafblock_t *)tmpbuffer;
@@ -2290,6 +2292,8 @@ xfs_attr3_leaf_unbalance(
 		struct xfs_attr3_icleaf_hdr tmphdr;
 
 		tmp_leaf = kmem_zalloc(state->args->geo->blksize, 0);
+		if (!tmp_leaf)
+			return;
 
 		/*
 		 * Copy the header into the temp leaf so that all the stuff
-- 
2.25.1