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intel_th: msu: Fix window switching without windows 

Commit 6cac7866c2 ("intel_th: msu: Add a sysfs attribute to trigger
window switch") adds a NULL pointer dereference in the case when there are
no windows allocated:

> BUG: kernel NULL pointer dereference, address: 0000000000000000
> #PF: supervisor read access in kernel mode
> #PF: error_code(0x0000) - not-present page
> PGD 0 P4D 0
> Oops: 0000 1 SMP
> CPU: 5 PID: 1110 Comm: bash Not tainted 5.5.0-rc1+ #1
> RIP: 0010:msc_win_switch+0xa/0x80 [intel_th_msu]
> Call Trace:
> ? win_switch_store+0x9b/0xc0 [intel_th_msu]
> dev_attr_store+0x17/0x30
> sysfs_kf_write+0x3e/0x50
> kernfs_fop_write+0xda/0x1b0
> __vfs_write+0x1b/0x40
> vfs_write+0xb9/0x1a0
> ksys_write+0x67/0xe0
> __x64_sys_write+0x1a/0x20
> do_syscall_64+0x57/0x1d0
> entry_SYSCALL_64_after_hwframe+0x44/0xa9

Fix that by disallowing window switching with multiwindow buffers without
windows.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Fixes: 6cac7866c2 ("intel_th: msu: Add a sysfs attribute to trigger window switch")
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reported-by: Ammy Yi <ammy.yi@intel.com>
Tested-by: Ammy Yi <ammy.yi@intel.com>
Cc: stable@vger.kernel.org # v5.2+
Link: https://lore.kernel.org/r/20191217115527.74383-5-alexander.shishkin@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
alistair/sunxi64-5.5-dsi
Alexander Shishkin 2019-12-17 13:55:27 +02:00 committed by Greg Kroah-Hartman
parent ab832e38e4
commit 05b686b573
1 changed files with 9 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/hwtracing/intel_th/msu.c
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@ -1676,10 +1676,13 @@ static int intel_th_msc_init(struct msc *msc)
return 0;
}
static void msc_win_switch(struct msc *msc)
static int msc_win_switch(struct msc *msc)
{
struct msc_window *first;
if (list_empty(&msc->win_list))
return -EINVAL;
first = list_first_entry(&msc->win_list, struct msc_window, entry);
if (msc_is_last_win(msc->cur_win))
@ -1691,6 +1694,8 @@ static void msc_win_switch(struct msc *msc)
msc->base_addr = msc_win_base_dma(msc->cur_win);
intel_th_trace_switch(msc->thdev);
return 0;
}
/**
@ -2025,16 +2030,15 @@ win_switch_store(struct device *dev, struct device_attribute *attr,
if (val != 1)
return -EINVAL;
ret = -EINVAL;
mutex_lock(&msc->buf_mutex);
/*
* Window switch can only happen in the "multi" mode.
* If a external buffer is engaged, they have the full
* control over window switching.
*/
if (msc->mode != MSC_MODE_MULTI || msc->mbuf)
ret = -ENOTSUPP;
else
msc_win_switch(msc);
if (msc->mode == MSC_MODE_MULTI && !msc->mbuf)
ret = msc_win_switch(msc);
mutex_unlock(&msc->buf_mutex);
return ret ? ret : size;