diff options
| author | Mark A. Greer <mgreer@animalcreek.com> | 2013-05-29 12:25:34 -0700 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2013-06-12 10:20:55 -0400 |
| commit | f873ded213d6d8c36354c0fc903af44da4fd6ac5 (patch) | |
| tree | 7a376ab7f12519345323222c4b22d6734a5e5aec /drivers | |
| parent | 96570ffcca0b872dc8626e97569d2697f374d868 (diff) | |
mwifiex: debugfs: Fix out of bounds array access
When reading the contents of '/sys/kernel/debug/mwifiex/p2p0/info',
the following panic occurs:
$ cat /sys/kernel/debug/mwifiex/p2p0/info
Unable to handle kernel paging request at virtual address 74706164
pgd = de530000
[74706164] *pgd=00000000
Internal error: Oops: 5 [#1] SMP ARM
Modules linked in: phy_twl4030_usb omap2430 musb_hdrc mwifiex_sdio mwifiex
CPU: 0 PID: 1635 Comm: cat Not tainted 3.10.0-rc1-00010-g1268390 #1
task: de16b6c0 ti: de048000 task.ti: de048000
PC is at strnlen+0xc/0x4c
LR is at string+0x3c/0xf8
pc : [<c02c123c>] lr : [<c02c2d1c>] psr: a0000013
sp : de049e10 ip : c06efba0 fp : de6d2092
r10: bf01a260 r9 : ffffffff r8 : 74706164
r7 : 0000ffff r6 : ffffffff r5 : de6d209c r4 : 00000000
r3 : ff0a0004 r2 : 74706164 r1 : ffffffff r0 : 74706164
Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
Control: 10c5387d Table: 9e530019 DAC: 00000015
Process cat (pid: 1635, stack limit = 0xde048240)
Stack: (0xde049e10 to 0xde04a000)
9e00: de6d2092 00000002 bf01a25e de6d209c
9e20: de049e80 c02c438c 0000000a ff0a0004 ffffffff 00000000 00000000 de049e48
9e40: 00000000 2192df6d ff0a0004 ffffffff 00000000 de6d2092 de049ef8 bef3cc00
9e60: de6b0000 dc358000 de6d2000 00000000 00000003 c02c45a4 bf01790c bf01a254
9e80: 74706164 bf018698 00000000 de59c3c0 de048000 de049f80 00001000 bef3cc00
9ea0: 00000008 00000000 00000000 00000000 00000000 00000000 00000000 00000000
9ec0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
9ee0: 00000000 00000000 00000000 00000001 00000000 00000000 6669776d 20786569
9f00: 20302e31 2e343128 392e3636 3231702e 00202933 00000000 00000003 c0294898
9f20: 00000000 00000000 00000000 00000000 de59c3c0 c0107c04 de554000 de59c3c0
9f40: 00001000 bef3cc00 de049f80 bef3cc00 de049f80 00000000 00000003 c0108a00
9f60: de048000 de59c3c0 00000000 00000000 de59c3c0 00001000 bef3cc00 c0108b60
9f80: 00000000 00000000 00001000 bef3cc00 00000003 00000003 c0014128 de048000
9fa0: 00000000 c0013f80 00001000 bef3cc00 00000003 bef3cc00 00001000 00000000
9fc0: 00001000 bef3cc00 00000003 00000003 00000001 00000001 00000001 00000003
9fe0: 00000000 bef3cbdc 00011984 b6f1127c 60000010 00000003 18dbdd2c 7f7bfffd
[<c02c123c>] (strnlen+0xc/0x4c) from [<c02c2d1c>] (string+0x3c/0xf8)
[<c02c2d1c>] (string+0x3c/0xf8) from [<c02c438c>] (vsnprintf+0x1e8/0x3e8)
[<c02c438c>] (vsnprintf+0x1e8/0x3e8) from [<c02c45a4>] (sprintf+0x18/0x24)
[<c02c45a4>] (sprintf+0x18/0x24) from [<bf01790c>] (mwifiex_info_read+0xfc/0x3e8 [mwifiex])
[<bf01790c>] (mwifiex_info_read+0xfc/0x3e8 [mwifiex]) from [<c0108a00>] (vfs_read+0xb0/0x144)
[<c0108a00>] (vfs_read+0xb0/0x144) from [<c0108b60>] (SyS_read+0x44/0x70)
[<c0108b60>] (SyS_read+0x44/0x70) from [<c0013f80>] (ret_fast_syscall+0x0/0x30)
Code: e12fff1e e3510000 e1a02000 0a00000d (e5d03000)
---[ end trace ca98273dc605a04f ]---
The panic is caused by the mwifiex_info_read() routine assuming that
there can only be four modes (0-3) which is an invalid assumption.
For example, when testing P2P, the mode is '8' (P2P_CLIENT) so the
code accesses data beyond the bounds of the bss_modes[] array which
causes the panic. Fix this by updating bss_modes[] to support the
current list of modes and adding a check to prevent the out-of-bounds
access from occuring in the future when more modes are added.
Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Acked-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/wireless/mwifiex/debugfs.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/drivers/net/wireless/mwifiex/debugfs.c b/drivers/net/wireless/mwifiex/debugfs.c index 753b5682d53..a5f9875cfd6 100644 --- a/drivers/net/wireless/mwifiex/debugfs.c +++ b/drivers/net/wireless/mwifiex/debugfs.c @@ -26,10 +26,17 @@ static struct dentry *mwifiex_dfs_dir; static char *bss_modes[] = { - "Unknown", - "Ad-hoc", - "Managed", - "Auto" + "UNSPECIFIED", + "ADHOC", + "STATION", + "AP", + "AP_VLAN", + "WDS", + "MONITOR", + "MESH_POINT", + "P2P_CLIENT", + "P2P_GO", + "P2P_DEVICE", }; /* size/addr for mwifiex_debug_info */ @@ -200,7 +207,12 @@ mwifiex_info_read(struct file *file, char __user *ubuf, p += sprintf(p, "driver_version = %s", fmt); p += sprintf(p, "\nverext = %s", priv->version_str); p += sprintf(p, "\ninterface_name=\"%s\"\n", netdev->name); - p += sprintf(p, "bss_mode=\"%s\"\n", bss_modes[info.bss_mode]); + + if (info.bss_mode >= ARRAY_SIZE(bss_modes)) + p += sprintf(p, "bss_mode=\"%d\"\n", info.bss_mode); + else + p += sprintf(p, "bss_mode=\"%s\"\n", bss_modes[info.bss_mode]); + p += sprintf(p, "media_state=\"%s\"\n", (!priv->media_connected ? "Disconnected" : "Connected")); p += sprintf(p, "mac_address=\"%pM\"\n", netdev->dev_addr); |