linux-kernel - [PATCH v2] ntb_tool: check null return of devm_kcalloc in tool_init

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Message-Id: <20230307122021.1569285-1-void0red@gmail.com>
Date:   Tue,  7 Mar 2023 20:20:21 +0800
From:   Kang Chen <void0red@...il.com>
To:     fancer.lancer@...il.com
Cc:     allenbh@...il.com, dave.jiang@...el.com, jdmason@...zu.us,
        linux-kernel@...r.kernel.org, ntb@...ts.linux.dev,
        void0red@...il.com
Subject: [PATCH v2] 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.

Fixes: 7f46c8b3a552 ("NTB: ntb_tool: Add full multi-port NTB API support")
Signed-off-by: Kang Chen <void0red@...il.com>
Reviewed-by: Serge Semin <fancer.lancer@...il.com>
---
v2 -> v1: add Fixes and Reviewed-by tags

 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