¿Cuánto cuesta una mala contratación?
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Una mala contratación cuesta 3X el salario. Evítalo con datos, no percepciones.
Hola, ,
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Initialize the eb.vma array with values of 0 when the eb structure is
first set up. In particular, this sets the eb->vma[i].vma pointers to
NULL, simplifying cleanup and getting rid of the bug described below.
During the execution of eb_lookup_vmas(), the eb->vma array is
successively filled up with struct eb_vma objects. This process includes
calling eb_add_vma(), which might fail; however, even in the event of
failure, eb->vma[i].vma is set for the currently processed buffer.
If eb_add_vma() fails, eb_lookup_vmas() returns with an error, which
prompts a call to eb_release_vmas() to clean up the mess. Since
eb_lookup_vmas() might fail during processing any (possibly not first)
buffer, eb_release_vmas() checks whether a buffer's vma is NULL to know
at what point did the lookup function fail.
In eb_lookup_vmas(), eb->vma[i].vma is set to NULL if either the helper
function eb_lookup_vma() or eb_validate_vma() fails. eb->vma[i+1].vma is
set to NULL in case i915_gem_object_userptr_submit_init() fails; the
current one needs to be cleaned up by eb_release_vmas() at this point,
so the next one is set. If eb_add_vma() fails, neither the current nor
the next vma is nullified, which is a source of a NULL deref bug
described in the issue linked in the Closes tag.
When entering eb_lookup_vmas(), the vma pointers are set to the slab
poison value, instead of NULL. This doesn't matter for the actual
lookup, since it gets overwritten anyway, however the eb_release_vmas()
function only recognizes NULL as the stopping value, hence the pointers
are being nullified as they go in case of intermediate failure. This
patch changes the approach to filling them all with NULL at the start
instead, rather than handling that manually during failure.
Reported-by: Gangmin Kim <km.kim1503(a)gmail.com>
Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/15062
Fixes: 544460c33821 ("drm/i915: Multi-BB execbuf")
Cc: <stable(a)vger.kernel.org> # 5.16.x
Signed-off-by: Krzysztof Niemiec <krzysztof.niemiec(a)intel.com>
---
I messed up the continuity in previous revisions; the original patch
was sent as [1], and the first revision (which I didn't mark as v2 due
to the title change) was sent as [2].
This is the full current changelog:
v3:
- use memset() to fill the entire eb.vma array with zeros instead of
looping through the elements (Janusz)
- add a comment clarifying the mechanism of the initial allocation (Janusz)
- change the commit log again, including title
- rearrange the tags to keep checkpatch happy
v2:
- set the eb->vma[i].vma pointers to NULL during setup instead of
ad-hoc at failure (Janusz)
- romanize the reporter's name (Andi, offline)
- change the commit log, including title
[1] https://patchwork.freedesktop.org/series/156832/
[2] https://patchwork.freedesktop.org/series/158036/
.../gpu/drm/i915/gem/i915_gem_execbuffer.c | 36 +++++++++----------
1 file changed, 16 insertions(+), 20 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index b057c2fa03a4..5f2b736b53ab 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -951,13 +951,13 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
vma = eb_lookup_vma(eb, eb->exec[i].handle);
if (IS_ERR(vma)) {
err = PTR_ERR(vma);
- goto err;
+ return err;
}
err = eb_validate_vma(eb, &eb->exec[i], vma);
if (unlikely(err)) {
i915_vma_put(vma);
- goto err;
+ return err;
}
err = eb_add_vma(eb, ¤t_batch, i, vma);
@@ -966,19 +966,8 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
if (i915_gem_object_is_userptr(vma->obj)) {
err = i915_gem_object_userptr_submit_init(vma->obj);
- if (err) {
- if (i + 1 < eb->buffer_count) {
- /*
- * Execbuffer code expects last vma entry to be NULL,
- * since we already initialized this entry,
- * set the next value to NULL or we mess up
- * cleanup handling.
- */
- eb->vma[i + 1].vma = NULL;
- }
-
+ if (err)
return err;
- }
eb->vma[i].flags |= __EXEC_OBJECT_USERPTR_INIT;
eb->args->flags |= __EXEC_USERPTR_USED;
@@ -986,10 +975,6 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
}
return 0;
-
-err:
- eb->vma[i].vma = NULL;
- return err;
}
static int eb_lock_vmas(struct i915_execbuffer *eb)
@@ -3375,7 +3360,9 @@ i915_gem_do_execbuffer(struct drm_device *dev,
eb.exec = exec;
eb.vma = (struct eb_vma *)(exec + args->buffer_count + 1);
- eb.vma[0].vma = NULL;
+
+ memset(eb.vma, 0x00, args->buffer_count * sizeof(struct eb_vma));
+
eb.batch_pool = NULL;
eb.invalid_flags = __EXEC_OBJECT_UNKNOWN_FLAGS;
@@ -3584,7 +3571,16 @@ i915_gem_execbuffer2_ioctl(struct drm_device *dev, void *data,
if (err)
return err;
- /* Allocate extra slots for use by the command parser */
+ /*
+ * Allocate extra slots for use by the command parser.
+ *
+ * Note that this allocation handles two different arrays (the
+ * exec2_list array, and the eventual eb.vma array introduced in
+ * i915_gem_do_execubuffer()), that reside in virtually contiguous
+ * memory. Also note that the allocation doesn't fill the area with
+ * zeros (the first part doesn't need to be), but the second part only
+ * is explicitly zeroed later in i915_gem_do_execbuffer().
+ */
exec2_list = kvmalloc_array(count + 2, eb_element_size(),
__GFP_NOWARN | GFP_KERNEL);
if (exec2_list == NULL) {
--
2.45.2
Hello,
On Sat, Nov 15, 2025 at 10:59:38AM +0100, Fernando Fernandez Mancera wrote:
> When an IPv6 Router Advertisement (RA) is received for a prefix, the
> kernel creates the corresponding on-link route with flags RTF_ADDRCONF
> and RTF_PREFIX_RT configured and RTF_EXPIRES if lifetime is set.
>
> If later a user configures a static IPv6 address on the same prefix the
> kernel clears the RTF_EXPIRES flag but it doesn't clear the RTF_ADDRCONF
> and RTF_PREFIX_RT. When the next RA for that prefix is received, the
> kernel sees the route as RA-learned and wrongly configures back the
> lifetime. This is problematic because if the route expires, the static
> address won't have the corresponding on-link route.
>
> This fix clears the RTF_ADDRCONF and RTF_PREFIX_RT flags preventing that
> the lifetime is configured when the next RA arrives. If the static
> address is deleted, the route becomes RA-learned again.
>
> Fixes: 14ef37b6d00e ("ipv6: fix route lookup in addrconf_prefix_rcv()")
> Reported-by: Garri Djavadyan <g.djavadyan(a)gmail.com>
> Closes: https://lore.kernel.org/netdev/ba807d39aca5b4dcf395cc11dca61a130a52cfd3.cam…
> Signed-off-by: Fernando Fernandez Mancera <fmancera(a)suse.de>
this commit is in the mainline now as
f72514b3c5698e4b900b25345e09f9ed33123de6 and is supposed to fix
https://bugs.debian.org/1117959.
I would have expected this to get backported to stable (here: 6.12.x),
but it's not in the list for 6.12.62-rc1[1].
Can we please have this patch backported?
[1] https://lore.kernel.org/all/20251210072948.125620687@linuxfoundation.org/
Thanks
Uwe
of_get_child_by_name() returns a node pointer with refcount incremented.
Use the __free() attribute to manage the pgc_node reference, ensuring
automatic of_node_put() cleanup when pgc_node goes out of scope.
This eliminates the need for explicit error handling paths and avoids
reference count leaks.
Fixes: 721cabf6c660 ("soc: imx: move PGC handling to a new GPC driver")
Cc: stable(a)vger.kernel.org
Signed-off-by: Wentao Liang <vulab(a)iscas.ac.cn>
---
Change in V3:
- Ensure variable is assigned when using cleanup attribute
Change in V2:
- Use __free() attribute instead of explicit of_node_put() calls
---
drivers/pmdomain/imx/gpc.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/pmdomain/imx/gpc.c b/drivers/pmdomain/imx/gpc.c
index f18c7e6e75dd..0fb3250dbf5f 100644
--- a/drivers/pmdomain/imx/gpc.c
+++ b/drivers/pmdomain/imx/gpc.c
@@ -403,13 +403,12 @@ static int imx_gpc_old_dt_init(struct device *dev, struct regmap *regmap,
static int imx_gpc_probe(struct platform_device *pdev)
{
const struct imx_gpc_dt_data *of_id_data = device_get_match_data(&pdev->dev);
- struct device_node *pgc_node;
+ struct device_node *pgc_node __free(pgc_node)
+ = of_get_child_by_name(pdev->dev.of_node, "pgc");
struct regmap *regmap;
void __iomem *base;
int ret;
- pgc_node = of_get_child_by_name(pdev->dev.of_node, "pgc");
-
/* bail out if DT too old and doesn't provide the necessary info */
if (!of_property_present(pdev->dev.of_node, "#power-domain-cells") &&
!pgc_node)
--
2.34.1
If the ufs resume fails, the event history is updated in ufshcd_resume,
but there is no code anywhere to record ufs suspend. Therefore, add code
to record ufs suspend error event history.
Fixes: dd11376b9f1b ("scsi: ufs: Split the drivers/scsi/ufs directory")
Cc: stable(a)vger.kernel.org
Signed-off-by: Seunghwan Baek <sh8267.baek(a)samsung.com>
---
drivers/ufs/core/ufshcd.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 040a0ceb170a..6bb2781aefc7 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -10337,7 +10337,7 @@ static int ufshcd_suspend(struct ufs_hba *hba)
ret = ufshcd_setup_clocks(hba, false);
if (ret) {
ufshcd_enable_irq(hba);
- return ret;
+ goto out;
}
if (ufshcd_is_clkgating_allowed(hba)) {
hba->clk_gating.state = CLKS_OFF;
@@ -10349,6 +10349,9 @@ static int ufshcd_suspend(struct ufs_hba *hba)
/* Put the host controller in low power mode if possible */
ufshcd_hba_vreg_set_lpm(hba);
ufshcd_pm_qos_update(hba, false);
+out:
+ if (ret)
+ ufshcd_update_evt_hist(hba, UFS_EVT_SUSPEND_ERR, (u32)ret);
return ret;
}
--
2.43.0
synaptics_i2c_irq() schedules touch->dwork via mod_delayed_work().
The delayed work performs I2C transactions and may still be running
(or get queued) when the device is removed.
synaptics_i2c_remove() currently frees 'touch' without canceling
touch->dwork. If removal happens while the work is pending/running,
the work handler may dereference freed memory, leading to a potential
use-after-free.
Cancel the delayed work synchronously before unregistering/freeing
the device.
Fixes: eef3e4cab72e Input: add driver for Synaptics I2C touchpad
Reported-by: Minseong Kim <ii4gsp(a)gmail.com>
Cc: stable(a)vger.kernel.org
Signed-off-by: Minseong Kim <ii4gsp(a)gmail.com>
---
drivers/input/mouse/synaptics_i2c.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/input/mouse/synaptics_i2c.c b/drivers/input/mouse/synaptics_i2c.c
index a0d707e47d93..fe30bf9aea3a 100644
--- a/drivers/input/mouse/synaptics_i2c.c
+++ b/drivers/input/mouse/synaptics_i2c.c
@@ -593,6 +593,8 @@ static void synaptics_i2c_remove(struct i2c_client *client)
if (!polling_req)
free_irq(client->irq, touch);
+ cancel_delayed_work_sync(&touch->dwork);
+
input_unregister_device(touch->input);
kfree(touch);
}
--
2.39.5