linux-kernel - [PATCH 4.14 141/210] fsi: core: Check error number after calling ida_simple

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Date:   Mon, 24 Oct 2022 13:30:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>,
        Eddie James <eajames@...ux.ibm.com>,
        Joel Stanley <joel@....id.au>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 141/210] fsi: core: Check error number after calling ida_simple_get

From: Jiasheng Jiang <jiasheng@...as.ac.cn>

[ Upstream commit 35af9fb49bc5c6d61ef70b501c3a56fe161cce3e ]

If allocation fails, the ida_simple_get() will return error number.
So master->idx could be error number and be used in dev_set_name().
Therefore, it should be better to check it and return error if fails,
like the ida_simple_get() in __fsi_get_new_minor().

Fixes: 09aecfab93b8 ("drivers/fsi: Add fsi master definition")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
Reviewed-by: Eddie James <eajames@...ux.ibm.com>
Link: https://lore.kernel.org/r/20220111073411.614138-1-jiasheng@iscas.ac.cn
Signed-off-by: Joel Stanley <joel@....id.au>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/fsi/fsi-core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index 8feca59c1f6b..392efc2a4b8c 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -821,6 +821,9 @@ int fsi_master_register(struct fsi_master *master)
 		return -EINVAL;
 
 	master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL);
+	if (master->idx < 0)
+		return master->idx;
+
 	dev_set_name(&master->dev, "fsi%d", master->idx);
 
 	rc = device_register(&master->dev);
-- 
2.35.1