mac80211: backport today's brcmfmac changes

[15.05/openwrt.git] / package / kernel / mac80211 / patches / 373-brcmfmac-avoid-null-pointer-access-when-brcmf_msgbuf.patch

diff --git a/package/kernel/mac80211/patches/373-brcmfmac-avoid-null-pointer-access-when-brcmf_msgbuf.patch b/package/kernel/mac80211/patches/373-brcmfmac-avoid-null-pointer-access-when-brcmf_msgbuf.patch
new file mode 100644 (file)
index 0000000..28408d2
--- /dev/null
+++ b/package/kernel/mac80211/patches/373-brcmfmac-avoid-null-pointer-access-when-brcmf_msgbuf.patch
@@ -0,0 +1,102 @@
+From: Arend van Spriel <arend@broadcom.com>
+Date: Tue, 26 May 2015 13:19:46 +0200
+Subject: [PATCH] brcmfmac: avoid null pointer access when
+ brcmf_msgbuf_get_pktid() fails
+
+The function brcmf_msgbuf_get_pktid() may return a NULL pointer so
+the callers should check the return pointer before accessing it to
+avoid the crash below (see [1]):
+
+brcmfmac: brcmf_msgbuf_get_pktid: Invalid packet id 273 (not in use)
+BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
+IP: [<ffffffff8145b225>] skb_pull+0x5/0x50
+PGD 0
+Oops: 0000 [#1] PREEMPT SMP
+Modules linked in: pci_stub vboxpci(O) vboxnetflt(O) vboxnetadp(O) vboxdrv(O)
+ snd_hda_codec_hdmi bnep mousedev hid_generic ushwmon msr ext4 crc16 mbcache
+ jbd2 sd_mod uas usb_storage ahci libahci libata scsi_mod xhci_pci xhci_hcd
+ usbcore usb_common
+CPU: 0 PID: 1661 Comm: irq/61-brcmf_pc Tainted: G O    4.0.1-MacbookPro-ARCH #1
+Hardware name: Apple Inc. MacBookPro12,1/Mac-E43C1C25D4880AD6,
+ BIOS MBP121.88Z.0167.B02.1503241251 03/24/2015
+task: ffff880264203cc0 ti: ffff88025ffe4000 task.ti: ffff88025ffe4000
+RIP: 0010:[<ffffffff8145b225>]  [<ffffffff8145b225>] skb_pull+0x5/0x50
+RSP: 0018:ffff88025ffe7d40  EFLAGS: 00010202
+RAX: 0000000000000000 RBX: ffff88008a33c000 RCX: 0000000000000044
+RDX: 0000000000000000 RSI: 000000000000004a RDI: 0000000000000000
+RBP: ffff88025ffe7da8 R08: 0000000000000096 R09: 000000000000004a
+R10: 0000000000000000 R11: 000000000000048e R12: ffff88025ff14f00
+R13: 0000000000000000 R14: ffff880263b48200 R15: ffff88008a33c000
+FS:  0000000000000000(0000) GS:ffff88026ec00000(0000) knlGS:0000000000000000
+CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
+CR2: 0000000000000080 CR3: 000000000180b000 CR4: 00000000003407f0
+Stack:
+ ffffffffa06aed74 ffff88025ffe7dc8 ffff880263b48270 ffff880263b48278
+ 05ea88020000004a 0002ffff81014635 000000001720b2f6 ffff88026ec116c0
+ ffff880263b48200 0000000000010000 ffff880263b4ae00 ffff880264203cc0
+Call Trace:
+ [<ffffffffa06aed74>] ? brcmf_msgbuf_process_rx+0x404/0x480 [brcmfmac]
+ [<ffffffff810cea60>] ? irq_finalize_oneshot.part.30+0xf0/0xf0
+ [<ffffffffa06afb55>] brcmf_proto_msgbuf_rx_trigger+0x35/0xf0 [brcmfmac]
+ [<ffffffffa06baf2a>] brcmf_pcie_isr_thread_v2+0x8a/0x130 [brcmfmac]
+ [<ffffffff810cea80>] irq_thread_fn+0x20/0x50
+ [<ffffffff810ceddf>] irq_thread+0x13f/0x170
+ [<ffffffff810cebf0>] ? wake_threads_waitq+0x30/0x30
+ [<ffffffff810ceca0>] ? irq_thread_dtor+0xb0/0xb0
+ [<ffffffff81092a08>] kthread+0xd8/0xf0
+ [<ffffffff81092930>] ? kthread_create_on_node+0x1c0/0x1c0
+ [<ffffffff8156d898>] ret_from_fork+0x58/0x90
+ [<ffffffff81092930>] ? kthread_create_on_node+0x1c0/0x1c0
+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
+ f7 88 50 01 c3 66 0f 1f 84 00 00 00 00 00 0f 1f
+RIP  [<ffffffff8145b225>] skb_pull+0x5/0x50
+ RSP <ffff88025ffe7d40>
+CR2: 0000000000000080
+---[ end trace b074c0f90e7c997d ]---
+
+[1] http://mid.gmane.org/20150430193259.GA5630@googlemail.com
+
+Cc: <stable@vger.kernel.org> # v3.18, v3.19, v4.0, v4.1
+Reported-by: Michael Hornung <mhornung.linux@gmail.com>
+Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
+Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
+Signed-off-by: Arend van Spriel <arend@broadcom.com>
+---
+
+--- a/drivers/net/wireless/brcm80211/brcmfmac/msgbuf.c
++++ b/drivers/net/wireless/brcm80211/brcmfmac/msgbuf.c
+@@ -500,11 +500,9 @@ static int brcmf_msgbuf_query_dcmd(struc
+                                    msgbuf->rx_pktids,
+                                    msgbuf->ioctl_resp_pktid);
+       if (msgbuf->ioctl_resp_ret_len != 0) {
+-              if (!skb) {
+-                      brcmf_err("Invalid packet id idx recv'd %d\n",
+-                                msgbuf->ioctl_resp_pktid);
++              if (!skb)
+                       return -EBADF;
+-              }
++
+               memcpy(buf, skb->data, (len < msgbuf->ioctl_resp_ret_len) ?
+                                      len : msgbuf->ioctl_resp_ret_len);
+       }
+@@ -866,10 +864,8 @@ brcmf_msgbuf_process_txstatus(struct brc
+       flowid -= BRCMF_NROF_H2D_COMMON_MSGRINGS;
+       skb = brcmf_msgbuf_get_pktid(msgbuf->drvr->bus_if->dev,
+                                    msgbuf->tx_pktids, idx);
+-      if (!skb) {
+-              brcmf_err("Invalid packet id idx recv'd %d\n", idx);
++      if (!skb)
+               return;
+-      }
+ 
+       set_bit(flowid, msgbuf->txstatus_done_map);
+       commonring = msgbuf->flowrings[flowid];
+@@ -1148,6 +1144,8 @@ brcmf_msgbuf_process_rx_complete(struct
+ 
+       skb = brcmf_msgbuf_get_pktid(msgbuf->drvr->bus_if->dev,
+                                    msgbuf->rx_pktids, idx);
++      if (!skb)
++              return;
+ 
+       if (data_offset)
+               skb_pull(skb, data_offset);