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| author | Zekun Shen <bruceshenzk@gmail.com> | 2021-10-28 18:37:49 -0400 |
|---|---|---|
| committer | Kalle Valo <kvalo@codeaurora.org> | 2021-11-12 09:53:57 +0200 |
| commit | ae80b6033834342601e99f74f6a62ff5092b1cee (patch) | |
| tree | 7f86a0b3c47d130eeae352635db0d4bc426716d3 /drivers/net/wireless/ath/ar5523 | |
| parent | b2beffa7d9a67b59b085616a27f1d10b1e80784f (diff) | |
| download | linux-stable-ae80b6033834342601e99f74f6a62ff5092b1cee.tar.gz linux-stable-ae80b6033834342601e99f74f6a62ff5092b1cee.tar.bz2 linux-stable-ae80b6033834342601e99f74f6a62ff5092b1cee.zip | |
ar5523: Fix null-ptr-deref with unexpected WDCMSG_TARGET_START reply
Unexpected WDCMSG_TARGET_START replay can lead to null-ptr-deref
when ar->tx_cmd->odata is NULL. The patch adds a null check to
prevent such case.
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
ar5523_cmd+0x46a/0x581 [ar5523]
ar5523_probe.cold+0x1b7/0x18da [ar5523]
? ar5523_cmd_rx_cb+0x7a0/0x7a0 [ar5523]
? __pm_runtime_set_status+0x54a/0x8f0
? _raw_spin_trylock_bh+0x120/0x120
? pm_runtime_barrier+0x220/0x220
? __pm_runtime_resume+0xb1/0xf0
usb_probe_interface+0x25b/0x710
really_probe+0x209/0x5d0
driver_probe_device+0xc6/0x1b0
device_driver_attach+0xe2/0x120
I found the bug using a custome USBFuzz port. It's a research work
to fuzz USB stack/drivers. I modified it to fuzz ath9k driver only,
providing hand-crafted usb descriptors to QEMU.
After fixing the code (fourth byte in usb packet) to WDCMSG_TARGET_START,
I got the null-ptr-deref bug. I believe the bug is triggerable whenever
cmd->odata is NULL. After patching, I tested with the same input and no
longer see the KASAN report.
This was NOT tested on a real device.
Signed-off-by: Zekun Shen <bruceshenzk@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/YXsmPQ3awHFLuAj2@10-18-43-117.dynapool.wireless.nyu.edu
Diffstat (limited to 'drivers/net/wireless/ath/ar5523')
| -rw-r--r-- | drivers/net/wireless/ath/ar5523/ar5523.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/ar5523/ar5523.c b/drivers/net/wireless/ath/ar5523/ar5523.c index 0e9bad33fac8..141c1b5a7b1f 100644 --- a/drivers/net/wireless/ath/ar5523/ar5523.c +++ b/drivers/net/wireless/ath/ar5523/ar5523.c @@ -153,6 +153,10 @@ static void ar5523_cmd_rx_cb(struct urb *urb) ar5523_err(ar, "Invalid reply to WDCMSG_TARGET_START"); return; } + if (!cmd->odata) { + ar5523_err(ar, "Unexpected WDCMSG_TARGET_START reply"); + return; + } memcpy(cmd->odata, hdr + 1, sizeof(u32)); cmd->olen = sizeof(u32); cmd->res = 0; |