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r8152: check the pointer rtl_fw->fw before using it

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Fix the pointer rtl_fw->fw would be used before checking in
rtl8152_apply_firmware() that causes the following kernel oops.

Unable to handle kernel NULL pointer dereference at virtual address 00000002
pgd = (ptrval)
[00000002] *pgd=00000000
Internal error: Oops: 5 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 0 PID: 131 Comm: kworker/0:2 Not tainted
5.4.0-rc1-00539-g9370f2d05a2a #6788
Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
Workqueue: events_long rtl_hw_phy_work_func_t
PC is at rtl8152_apply_firmware+0x14/0x464
LR is at r8153_hw_phy_cfg+0x24/0x17c
pc : [<c064f4e4>]    lr : [<c064fa18>]    psr: a0000013
sp : e75c9e60  ip : 60000013  fp : c11b7614
r10: e883b91c  r9 : 00000000  r8 : fffffffe
r7 : e883b640  r6 : fffffffe  r5 : fffffffe  r4 : e883b640
r3 : 736cfe7c  r2 : 736cfe7c  r1 : 000052f8  r0 : e883b640
Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 10c5387d  Table: 6640006a  DAC: 00000051
Process kworker/0:2 (pid: 131, stack limit = 0x(ptrval))
Stack: (0xe75c9e60 to 0xe75ca000)
...
[<c064f4e4>] (rtl8152_apply_firmware) from [<c064fa18>]
(r8153_hw_phy_cfg+0x24/0x17c)
[<c064fa18>] (r8153_hw_phy_cfg) from [<c064e784>]
(rtl_hw_phy_work_func_t+0x220/0x3e4)
[<c064e784>] (rtl_hw_phy_work_func_t) from [<c0148a74>]
(process_one_work+0x22c/0x7c8)
[<c0148a74>] (process_one_work) from [<c0149054>] (worker_thread+0x44/0x520)
[<c0149054>] (worker_thread) from [<c0150548>] (kthread+0x130/0x164)
[<c0150548>] (kthread) from [<c01010b4>] (ret_from_fork+0x14/0x20)
Exception stack(0xe75c9fb0 to 0xe75c9ff8)
...

Fixes: 9370f2d05a ("r8152: support request_firmware for RTL8153")
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hayes Wang 2019-10-23 21:24:44 +08:00 committed by David S. Miller
parent 503a64635d
commit 8e484ebb1e
1 changed files with 5 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/net/usb/r8152.c
View File

@ -4000,8 +4000,8 @@ static void rtl8152_fw_mac_apply(struct r8152 *tp, struct fw_mac *mac)
static void rtl8152_apply_firmware(struct r8152 *tp)
{
struct rtl_fw *rtl_fw = &tp->rtl_fw;
const struct firmware *fw = rtl_fw->fw;
struct fw_header *fw_hdr = (struct fw_header *)fw->data;
const struct firmware *fw;
struct fw_header *fw_hdr;
struct fw_phy_patch_key *key;
u16 key_addr = 0;
int i;
@ -4009,6 +4009,9 @@ static void rtl8152_apply_firmware(struct r8152 *tp)
if (IS_ERR_OR_NULL(rtl_fw->fw))
return;
fw = rtl_fw->fw;
fw_hdr = (struct fw_header *)fw->data;
if (rtl_fw->pre_fw)
rtl_fw->pre_fw(tp);