linux-kernel - [PATCH] atm: idt77252: fix a memleak in open_card

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Date: Thu,  1 Feb 2024 20:41:05 +0800
From: Zhipeng Lu <alexious@....edu.cn>
To: alexious@....edu.cn
Cc: Chas Williams <3chas3@...il.com>,
	linux-atm-general@...ts.sourceforge.net,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] atm: idt77252: fix a memleak in open_card_ubr0

When alloc_scq fails, card->vcs[0] (i.e. vc) should be freed. Otherwise,
in the following call chain:

idt77252_init_one
  |-> idt77252_dev_open
        |-> open_card_ubr0
              |-> alloc_scq [failed]
  |-> deinit_card
        |-> vfree(card->vcs);

card->vcs is freed and card->vcs[0] is leaked.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Zhipeng Lu <alexious@....edu.cn>
---
 drivers/atm/idt77252.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/atm/idt77252.c b/drivers/atm/idt77252.c
index e327a0229dc1..e7f713cd70d3 100644
--- a/drivers/atm/idt77252.c
+++ b/drivers/atm/idt77252.c
@@ -2930,6 +2930,8 @@ open_card_ubr0(struct idt77252_dev *card)
 	vc->scq = alloc_scq(card, vc->class);
 	if (!vc->scq) {
 		printk("%s: can't get SCQ.\n", card->name);
+		kfree(card->vcs[0]);
+		card->vcs[0] = NULL;
 		return -ENOMEM;
 	}
 
-- 
2.34.1