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Date: Fri, 17 Mar 2023 03:52:28 +0000 From: Li Zetao <lizetao1@...wei.com> To: <3chas3@...il.com> CC: <lizetao1@...wei.com>, <linux-atm-general@...ts.sourceforge.net>, <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org> Subject: [PATCH] atm: idt77252: fix kmemleak when rmmod idt77252 There are memory leaks reported by kmemleak: unreferenced object 0xffff888106500800 (size 128): comm "modprobe", pid 1017, jiffies 4297787785 (age 67.152s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000970ce626>] __kmem_cache_alloc_node+0x20c/0x380 [<00000000fb5f78d9>] kmalloc_trace+0x2f/0xb0 [<000000000e947e2a>] idt77252_init_one+0x2847/0x3c90 [idt77252] [<000000006efb048e>] local_pci_probe+0xeb/0x1a0 ... unreferenced object 0xffff888106500b00 (size 128): comm "modprobe", pid 1017, jiffies 4297787785 (age 67.152s) hex dump (first 32 bytes): 00 20 3d 01 80 88 ff ff 00 20 3d 01 80 88 ff ff . =...... =..... f0 23 3d 01 80 88 ff ff 00 20 3d 01 00 00 00 00 .#=...... =..... backtrace: [<00000000970ce626>] __kmem_cache_alloc_node+0x20c/0x380 [<00000000fb5f78d9>] kmalloc_trace+0x2f/0xb0 [<00000000f451c5be>] alloc_scq.constprop.0+0x4a/0x400 [idt77252] [<00000000e6313849>] idt77252_init_one+0x28cf/0x3c90 [idt77252] The root cause is traced to the vc_maps which alloced in open_card_oam() are not freed in close_card_oam(). The vc_maps are used to record open connections, so when close a vc_map in close_card_oam(), the memory should be freed. Moreover, the ubr0 is not closed when close a idt77252 device, leading to the memory leak of vc_map and scq_info. Fix them by adding kfree in close_card_oam() and implementing new close_card_ubr0() to close ubr0. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Li Zetao <lizetao1@...wei.com> --- drivers/atm/idt77252.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/atm/idt77252.c b/drivers/atm/idt77252.c index eec0cc2144e0..060f32b0def3 100644 --- a/drivers/atm/idt77252.c +++ b/drivers/atm/idt77252.c @@ -2909,6 +2909,7 @@ close_card_oam(struct idt77252_dev *card) recycle_rx_pool_skb(card, &vc->rcv.rx_pool); } + kfree(vc); } } } @@ -2952,6 +2953,16 @@ open_card_ubr0(struct idt77252_dev *card) return 0; } +static void +close_card_ubr0(struct idt77252_dev *card) +{ + struct vc_map *vc; + + vc = card->vcs[0]; + free_scq(card, vc->scq); + kfree(vc); +} + static int idt77252_dev_open(struct idt77252_dev *card) { @@ -3001,6 +3012,7 @@ static void idt77252_dev_close(struct atm_dev *dev) struct idt77252_dev *card = dev->dev_data; u32 conf; + close_card_ubr0(card); close_card_oam(card); conf = SAR_CFG_RXPTH | /* enable receive path */ -- 2.25.1
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