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SubjectRe: [PATCH] jffs2: ensure wbuf_verify is valid before using it.
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ping ?

On 2018/12/9 14:35, Hou Tao wrote:
> ping ?
>
> On 2018/10/20 20:08, Hou Tao wrote:
>> Now MTD emulated by UBI volumn doesn't allocate wbuf_verify in
>> jffs2_ubivol_setup(), because UBI can do the verifcation itself,
>> so when CONFIG_JFFS2_FS_WBUF_VERIFY is enabled and a MTD device
>> emulated by UBI volumn is used, a Oops will occur as show in the
>> following trace:
>>
>> general protection fault: 0000 [#1] SMP KASAN PTI
>> CPU: 6 PID: 404 Comm: kworker/6:1 Not tainted 4.19.0-rc8
>> Workqueue: events_long delayed_wbuf_sync
>> RIP: 0010:ubi_io_read+0x156/0x650
>> Call Trace:
>> ubi_eba_read_leb+0x57d/0xba0
>> ubi_leb_read+0xe5/0x1b0
>> gluebi_read+0x10c/0x1a0
>> mtd_read+0x112/0x340
>> jffs2_verify_write+0xef/0x440
>> __jffs2_flush_wbuf+0x3fa/0x3540
>> jffs2_flush_wbuf_gc+0x1b1/0x2e0
>> process_one_work+0x58b/0x11e0
>> worker_thread+0x8f/0xfe0
>> kthread+0x2ae/0x3a0
>> ret_from_fork+0x35/0x40
>>
>> Fix the problem by checking the validity of wbuf_verify before
>> using it in jffs2_verify_write().
>>
>> Cc: stable@vger.kernel.org
>> Fixes: 0029da3bf430 ("JFFS2: add UBI support")
>> Signed-off-by: Hou Tao <houtao1@huawei.com>
>> ---
>> fs/jffs2/wbuf.c | 7 +++++++
>> 1 file changed, 7 insertions(+)
>>
>> diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c
>> index c6821a509481..3de45f4559d1 100644
>> --- a/fs/jffs2/wbuf.c
>> +++ b/fs/jffs2/wbuf.c
>> @@ -234,6 +234,13 @@ static int jffs2_verify_write(struct jffs2_sb_info *c, unsigned char *buf,
>> size_t retlen;
>> char *eccstr;
>>
>> + /*
>> + * MTD emulated by UBI volume doesn't allocate wbuf_verify,
>> + * because it can do the verification itself.
>> + */
>> + if (!c->wbuf_verify)
>> + return 0;
>> +
>> ret = mtd_read(c->mtd, ofs, c->wbuf_pagesize, &retlen, c->wbuf_verify);
>> if (ret && ret != -EUCLEAN && ret != -EBADMSG) {
>> pr_warn("%s(): Read back of page at %08x failed: %d\n",
>>
>
>
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/
>
>

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