linux-kernel - [PATCH] ntb_tool: check null return of devm_kcalloc in tool_init

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Message-Id: <20230226055743.2522819-1-void0red@gmail.com>
Date:   Sun, 26 Feb 2023 13:57:43 +0800
From:   Kang Chen <void0red@...il.com>
To:     jdmason@...zu.us
Cc:     dave.jiang@...el.com, allenbh@...il.com, ntb@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Kang Chen <void0red@...il.com>
Subject: [PATCH] ntb_tool: check null return of devm_kcalloc in tool_init_mws

devm_kcalloc may fails, tc->peers[pidx].outmws might be null
and will cause null pointer dereference later.

Signed-off-by: Kang Chen <void0red@...il.com>
---
 drivers/ntb/test/ntb_tool.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/ntb/test/ntb_tool.c b/drivers/ntb/test/ntb_tool.c
index 5ee0afa62..eeeb4b1c9 100644
--- a/drivers/ntb/test/ntb_tool.c
+++ b/drivers/ntb/test/ntb_tool.c
@@ -998,6 +998,8 @@ static int tool_init_mws(struct tool_ctx *tc)
 		tc->peers[pidx].outmws =
 			devm_kcalloc(&tc->ntb->dev, tc->peers[pidx].outmw_cnt,
 				   sizeof(*tc->peers[pidx].outmws), GFP_KERNEL);
+		if (tc->peers[pidx].outmws == NULL)
+			return -ENOMEM;
 
 		for (widx = 0; widx < tc->peers[pidx].outmw_cnt; widx++) {
 			tc->peers[pidx].outmws[widx].pidx = pidx;
-- 
2.34.1