linux-kernel - [PATCH] fsi: core: Check error number after calling ida_simple

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Date:   Tue, 11 Jan 2022 15:34:11 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     jk@...abs.org, joel@....id.au, alistair@...ple.id.au,
        eajames@...ux.ibm.com
Cc:     linux-fsi@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] fsi: core: Check error number after calling ida_simple_get

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>
---
 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 59ddc9fd5bca..92e6eebd1851 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -1309,6 +1309,9 @@ int fsi_master_register(struct fsi_master *master)
 
 	mutex_init(&master->scan_lock);
 	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);
 	master->dev.class = &fsi_master_class;
 
-- 
2.25.1