mirror of https://github.com/hak5/openwrt.git
103 lines
4.3 KiB
Diff
103 lines
4.3 KiB
Diff
From: Arend van Spriel <arend@broadcom.com>
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Date: Tue, 26 May 2015 13:19:46 +0200
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Subject: [PATCH] brcmfmac: avoid null pointer access when
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brcmf_msgbuf_get_pktid() fails
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The function brcmf_msgbuf_get_pktid() may return a NULL pointer so
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the callers should check the return pointer before accessing it to
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avoid the crash below (see [1]):
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brcmfmac: brcmf_msgbuf_get_pktid: Invalid packet id 273 (not in use)
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BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
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IP: [<ffffffff8145b225>] skb_pull+0x5/0x50
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PGD 0
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Oops: 0000 [#1] PREEMPT SMP
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Modules linked in: pci_stub vboxpci(O) vboxnetflt(O) vboxnetadp(O) vboxdrv(O)
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snd_hda_codec_hdmi bnep mousedev hid_generic ushwmon msr ext4 crc16 mbcache
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jbd2 sd_mod uas usb_storage ahci libahci libata scsi_mod xhci_pci xhci_hcd
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usbcore usb_common
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CPU: 0 PID: 1661 Comm: irq/61-brcmf_pc Tainted: G O 4.0.1-MacbookPro-ARCH #1
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Hardware name: Apple Inc. MacBookPro12,1/Mac-E43C1C25D4880AD6,
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BIOS MBP121.88Z.0167.B02.1503241251 03/24/2015
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task: ffff880264203cc0 ti: ffff88025ffe4000 task.ti: ffff88025ffe4000
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RIP: 0010:[<ffffffff8145b225>] [<ffffffff8145b225>] skb_pull+0x5/0x50
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RSP: 0018:ffff88025ffe7d40 EFLAGS: 00010202
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RAX: 0000000000000000 RBX: ffff88008a33c000 RCX: 0000000000000044
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RDX: 0000000000000000 RSI: 000000000000004a RDI: 0000000000000000
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RBP: ffff88025ffe7da8 R08: 0000000000000096 R09: 000000000000004a
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R10: 0000000000000000 R11: 000000000000048e R12: ffff88025ff14f00
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R13: 0000000000000000 R14: ffff880263b48200 R15: ffff88008a33c000
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FS: 0000000000000000(0000) GS:ffff88026ec00000(0000) knlGS:0000000000000000
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CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
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CR2: 0000000000000080 CR3: 000000000180b000 CR4: 00000000003407f0
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Stack:
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ffffffffa06aed74 ffff88025ffe7dc8 ffff880263b48270 ffff880263b48278
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05ea88020000004a 0002ffff81014635 000000001720b2f6 ffff88026ec116c0
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ffff880263b48200 0000000000010000 ffff880263b4ae00 ffff880264203cc0
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Call Trace:
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[<ffffffffa06aed74>] ? brcmf_msgbuf_process_rx+0x404/0x480 [brcmfmac]
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[<ffffffff810cea60>] ? irq_finalize_oneshot.part.30+0xf0/0xf0
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[<ffffffffa06afb55>] brcmf_proto_msgbuf_rx_trigger+0x35/0xf0 [brcmfmac]
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[<ffffffffa06baf2a>] brcmf_pcie_isr_thread_v2+0x8a/0x130 [brcmfmac]
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[<ffffffff810cea80>] irq_thread_fn+0x20/0x50
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[<ffffffff810ceddf>] irq_thread+0x13f/0x170
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[<ffffffff810cebf0>] ? wake_threads_waitq+0x30/0x30
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[<ffffffff810ceca0>] ? irq_thread_dtor+0xb0/0xb0
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[<ffffffff81092a08>] kthread+0xd8/0xf0
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[<ffffffff81092930>] ? kthread_create_on_node+0x1c0/0x1c0
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[<ffffffff8156d898>] ret_from_fork+0x58/0x90
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[<ffffffff81092930>] ? kthread_create_on_node+0x1c0/0x1c0
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Code: 01 83 e2 f7 88 50 01 48 83 c4 08 5b 5d f3 c3 0f 1f 80 00 00 00 00 83 e2
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f7 88 50 01 c3 66 0f 1f 84 00 00 00 00 00 0f 1f
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RIP [<ffffffff8145b225>] skb_pull+0x5/0x50
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RSP <ffff88025ffe7d40>
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CR2: 0000000000000080
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---[ end trace b074c0f90e7c997d ]---
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[1] http://mid.gmane.org/20150430193259.GA5630@googlemail.com
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Cc: <stable@vger.kernel.org> # v3.18, v3.19, v4.0, v4.1
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Reported-by: Michael Hornung <mhornung.linux@gmail.com>
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Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
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Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
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Signed-off-by: Arend van Spriel <arend@broadcom.com>
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---
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--- a/drivers/net/wireless/brcm80211/brcmfmac/msgbuf.c
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+++ b/drivers/net/wireless/brcm80211/brcmfmac/msgbuf.c
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@@ -500,11 +500,9 @@ static int brcmf_msgbuf_query_dcmd(struc
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msgbuf->rx_pktids,
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msgbuf->ioctl_resp_pktid);
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if (msgbuf->ioctl_resp_ret_len != 0) {
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- if (!skb) {
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- brcmf_err("Invalid packet id idx recv'd %d\n",
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- msgbuf->ioctl_resp_pktid);
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+ if (!skb)
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return -EBADF;
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- }
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+
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memcpy(buf, skb->data, (len < msgbuf->ioctl_resp_ret_len) ?
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len : msgbuf->ioctl_resp_ret_len);
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}
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@@ -866,10 +864,8 @@ brcmf_msgbuf_process_txstatus(struct brc
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flowid -= BRCMF_NROF_H2D_COMMON_MSGRINGS;
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skb = brcmf_msgbuf_get_pktid(msgbuf->drvr->bus_if->dev,
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msgbuf->tx_pktids, idx);
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- if (!skb) {
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- brcmf_err("Invalid packet id idx recv'd %d\n", idx);
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+ if (!skb)
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return;
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- }
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set_bit(flowid, msgbuf->txstatus_done_map);
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commonring = msgbuf->flowrings[flowid];
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@@ -1148,6 +1144,8 @@ brcmf_msgbuf_process_rx_complete(struct
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skb = brcmf_msgbuf_get_pktid(msgbuf->drvr->bus_if->dev,
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msgbuf->rx_pktids, idx);
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+ if (!skb)
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+ return;
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if (data_offset)
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skb_pull(skb, data_offset);
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