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thunderbolt: Fixes for v6.12-rc5

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This includes following USB4/Thunderbolt fixes for v6.12-rc5:
 
   - Fix KASAN reported stack out-of-bounds read
   - Honor Time Management Unit (TMU) requirements in the domain when
     configuring TMU mode of a newly plugged router.
 
 Both have been in linux-next with no reported issues.
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Merge tag 'thunderbolt-for-v6.12-rc5' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt into usb-linus

Mika writes:

thunderbolt: Fixes for v6.12-rc5

This includes following USB4/Thunderbolt fixes for v6.12-rc5:

  - Fix KASAN reported stack out-of-bounds read
  - Honor Time Management Unit (TMU) requirements in the domain when
    configuring TMU mode of a newly plugged router.

Both have been in linux-next with no reported issues.

* tag 'thunderbolt-for-v6.12-rc5' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt:
  thunderbolt: Honor TMU requirements in the domain when setting TMU mode
  thunderbolt: Fix KASAN reported stack out-of-bounds read in tb_retimer_scan()
This commit is contained in:
Greg Kroah-Hartman 2024-10-29 04:12:04 +01:00
commit 5963e0786a
2 changed files with 45 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/thunderbolt/retimer.c
View File

@ -516,7 +516,7 @@ int tb_retimer_scan(struct tb_port *port, bool add)
*/
tb_retimer_set_inbound_sbtx(port);
for (i = 1; i <= TB_MAX_RETIMER_INDEX; i++) {
for (max = 1, i = 1; i <= TB_MAX_RETIMER_INDEX; i++) {
/*
* Last retimer is true only for the last on-board
* retimer (the one connected directly to the Type-C
@ -527,9 +527,10 @@ int tb_retimer_scan(struct tb_port *port, bool add)
last_idx = i;
else if (ret < 0)
break;
max = i;
}
max = i;
ret = 0;
/* Add retimers if they do not exist already */

48
drivers/thunderbolt/tb.c
View File

@ -288,6 +288,24 @@ static void tb_increase_tmu_accuracy(struct tb_tunnel *tunnel)
device_for_each_child(&sw->dev, NULL, tb_increase_switch_tmu_accuracy);
}
static int tb_switch_tmu_hifi_uni_required(struct device *dev, void *not_used)
{
struct tb_switch *sw = tb_to_switch(dev);
if (sw && tb_switch_tmu_is_enabled(sw) &&
tb_switch_tmu_is_configured(sw, TB_SWITCH_TMU_MODE_HIFI_UNI))
return 1;
return device_for_each_child(dev, NULL,
tb_switch_tmu_hifi_uni_required);
}
static bool tb_tmu_hifi_uni_required(struct tb *tb)
{
return device_for_each_child(&tb->dev, NULL,
tb_switch_tmu_hifi_uni_required) == 1;
}
static int tb_enable_tmu(struct tb_switch *sw)
{
int ret;
@ -302,12 +320,30 @@ static int tb_enable_tmu(struct tb_switch *sw)
ret = tb_switch_tmu_configure(sw,
TB_SWITCH_TMU_MODE_MEDRES_ENHANCED_UNI);
if (ret == -EOPNOTSUPP) {
if (tb_switch_clx_is_enabled(sw, TB_CL1))
ret = tb_switch_tmu_configure(sw,
TB_SWITCH_TMU_MODE_LOWRES);
else
ret = tb_switch_tmu_configure(sw,
TB_SWITCH_TMU_MODE_HIFI_BI);
if (tb_switch_clx_is_enabled(sw, TB_CL1)) {
/*
* Figure out uni-directional HiFi TMU requirements
* currently in the domain. If there are no
* uni-directional HiFi requirements we can put the TMU
* into LowRes mode.
*
* Deliberately skip bi-directional HiFi links
* as these work independently of other links
* (and they do not allow any CL states anyway).
*/
if (tb_tmu_hifi_uni_required(sw->tb))
ret = tb_switch_tmu_configure(sw,
TB_SWITCH_TMU_MODE_HIFI_UNI);
else
ret = tb_switch_tmu_configure(sw,
TB_SWITCH_TMU_MODE_LOWRES);
} else {
ret = tb_switch_tmu_configure(sw, TB_SWITCH_TMU_MODE_HIFI_BI);
}
/* If not supported, fallback to bi-directional HiFi */
if (ret == -EOPNOTSUPP)
ret = tb_switch_tmu_configure(sw, TB_SWITCH_TMU_MODE_HIFI_BI);
}
if (ret)
return ret;