atm: idt77252: fix a memleak in open_card_ubr0

[ Upstream commit f3616173bf9be9bf39d131b120d6eea4e6324cb5 ]

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@zju.edu.cn>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/atm/idt77252.c b/drivers/atm/idt77252.c
index e327a02..e7f713c 100644 (file)
--- 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;
        }