From: Qiu-ji Chen <chenqiuji666(a)gmail.com>
stable inclusion
from stable-v5.10.231
commit d7408a052aa1b4f6fb6f1c7a8877b84017a07ac9
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBEDOW
CVE: CVE-2024-56700
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id…
--------------------------------
commit ca59f9956d4519ab18ab2270be47c6b8c6ced091 upstream.
Atomicity violation occurs when the fmc_send_cmd() function is executed
simultaneously with the modification of the fmdev->resp_skb value.
Consider a scenario where, after passing the validity check within the
function, a non-null fmdev->resp_skb variable is assigned a null value.
This results in an invalid fmdev->resp_skb variable passing the validity
check. As seen in the later part of the function, skb = fmdev->resp_skb;
when the invalid fmdev->resp_skb passes the check, a null pointer
dereference error may occur at line 478, evt_hdr = (void *)skb->data;
To address this issue, it is recommended to include the validity check of
fmdev->resp_skb within the locked section of the function. This
modification ensures that the value of fmdev->resp_skb does not change
during the validation process, thereby maintaining its validity.
This possible bug is found by an experimental static analysis tool
developed by our team. This tool analyzes the locking APIs
to extract function pairs that can be concurrently executed, and then
analyzes the instructions in the paired functions to identify possible
concurrency bugs including data races and atomicity violations.
Fixes: e8454ff7b9a4 ("[media] drivers:media:radio: wl128x: FM Driver Common sources")
Cc: stable(a)vger.kernel.org
Signed-off-by: Qiu-ji Chen <chenqiuji666(a)gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco(a)xs4all.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
Signed-off-by: dinglongwei <dinglongwei1(a)huawei.com>
---
drivers/media/radio/wl128x/fmdrv_common.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/media/radio/wl128x/fmdrv_common.c b/drivers/media/radio/wl128x/fmdrv_common.c
index 6142484d5cb4..d9287a935a9e 100644
--- a/drivers/media/radio/wl128x/fmdrv_common.c
+++ b/drivers/media/radio/wl128x/fmdrv_common.c
@@ -465,11 +465,12 @@ int fmc_send_cmd(struct fmdev *fmdev, u8 fm_op, u16 type, void *payload,
jiffies_to_msecs(FM_DRV_TX_TIMEOUT) / 1000);
return -ETIMEDOUT;
}
+ spin_lock_irqsave(&fmdev->resp_skb_lock, flags);
if (!fmdev->resp_skb) {
+ spin_unlock_irqrestore(&fmdev->resp_skb_lock, flags);
fmerr("Response SKB is missing\n");
return -EFAULT;
}
- spin_lock_irqsave(&fmdev->resp_skb_lock, flags);
skb = fmdev->resp_skb;
fmdev->resp_skb = NULL;
spin_unlock_irqrestore(&fmdev->resp_skb_lock, flags);
--
2.22.0
From: Qiu-ji Chen <chenqiuji666(a)gmail.com>
stable inclusion
from stable-v5.10.231
commit d7408a052aa1b4f6fb6f1c7a8877b84017a07ac9
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBEDOW
CVE: CVE-2024-56700
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id…
--------------------------------
commit ca59f9956d4519ab18ab2270be47c6b8c6ced091 upstream.
Atomicity violation occurs when the fmc_send_cmd() function is executed
simultaneously with the modification of the fmdev->resp_skb value.
Consider a scenario where, after passing the validity check within the
function, a non-null fmdev->resp_skb variable is assigned a null value.
This results in an invalid fmdev->resp_skb variable passing the validity
check. As seen in the later part of the function, skb = fmdev->resp_skb;
when the invalid fmdev->resp_skb passes the check, a null pointer
dereference error may occur at line 478, evt_hdr = (void *)skb->data;
To address this issue, it is recommended to include the validity check of
fmdev->resp_skb within the locked section of the function. This
modification ensures that the value of fmdev->resp_skb does not change
during the validation process, thereby maintaining its validity.
This possible bug is found by an experimental static analysis tool
developed by our team. This tool analyzes the locking APIs
to extract function pairs that can be concurrently executed, and then
analyzes the instructions in the paired functions to identify possible
concurrency bugs including data races and atomicity violations.
Fixes: e8454ff7b9a4 ("[media] drivers:media:radio: wl128x: FM Driver Common sources")
Cc: stable(a)vger.kernel.org
Signed-off-by: Qiu-ji Chen <chenqiuji666(a)gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco(a)xs4all.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
Signed-off-by: dinglongwei <dinglongwei1(a)huawei.com>
---
drivers/media/radio/wl128x/fmdrv_common.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/media/radio/wl128x/fmdrv_common.c b/drivers/media/radio/wl128x/fmdrv_common.c
index 6142484d5cb4..d9287a935a9e 100644
--- a/drivers/media/radio/wl128x/fmdrv_common.c
+++ b/drivers/media/radio/wl128x/fmdrv_common.c
@@ -465,11 +465,12 @@ int fmc_send_cmd(struct fmdev *fmdev, u8 fm_op, u16 type, void *payload,
jiffies_to_msecs(FM_DRV_TX_TIMEOUT) / 1000);
return -ETIMEDOUT;
}
+ spin_lock_irqsave(&fmdev->resp_skb_lock, flags);
if (!fmdev->resp_skb) {
+ spin_unlock_irqrestore(&fmdev->resp_skb_lock, flags);
fmerr("Response SKB is missing\n");
return -EFAULT;
}
- spin_lock_irqsave(&fmdev->resp_skb_lock, flags);
skb = fmdev->resp_skb;
fmdev->resp_skb = NULL;
spin_unlock_irqrestore(&fmdev->resp_skb_lock, flags);
--
2.22.0
From: Qiu-ji Chen <chenqiuji666(a)gmail.com>
stable inclusion
from stable-v6.6.64
commit 378ce4e08ca2b1ac7bbf1d57b68643ca4226c5f8
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBEDOW
CVE: CVE-2024-56700
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id…
--------------------------------
commit ca59f9956d4519ab18ab2270be47c6b8c6ced091 upstream.
Atomicity violation occurs when the fmc_send_cmd() function is executed
simultaneously with the modification of the fmdev->resp_skb value.
Consider a scenario where, after passing the validity check within the
function, a non-null fmdev->resp_skb variable is assigned a null value.
This results in an invalid fmdev->resp_skb variable passing the validity
check. As seen in the later part of the function, skb = fmdev->resp_skb;
when the invalid fmdev->resp_skb passes the check, a null pointer
dereference error may occur at line 478, evt_hdr = (void *)skb->data;
To address this issue, it is recommended to include the validity check of
fmdev->resp_skb within the locked section of the function. This
modification ensures that the value of fmdev->resp_skb does not change
during the validation process, thereby maintaining its validity.
This possible bug is found by an experimental static analysis tool
developed by our team. This tool analyzes the locking APIs
to extract function pairs that can be concurrently executed, and then
analyzes the instructions in the paired functions to identify possible
concurrency bugs including data races and atomicity violations.
Fixes: e8454ff7b9a4 ("[media] drivers:media:radio: wl128x: FM Driver Common sources")
Cc: stable(a)vger.kernel.org
Signed-off-by: Qiu-ji Chen <chenqiuji666(a)gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco(a)xs4all.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
Signed-off-by: dinglongwei <dinglongwei1(a)huawei.com>
---
drivers/media/radio/wl128x/fmdrv_common.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/media/radio/wl128x/fmdrv_common.c b/drivers/media/radio/wl128x/fmdrv_common.c
index 3da8e5102bec..1225dab9fc7d 100644
--- a/drivers/media/radio/wl128x/fmdrv_common.c
+++ b/drivers/media/radio/wl128x/fmdrv_common.c
@@ -466,11 +466,12 @@ int fmc_send_cmd(struct fmdev *fmdev, u8 fm_op, u16 type, void *payload,
jiffies_to_msecs(FM_DRV_TX_TIMEOUT) / 1000);
return -ETIMEDOUT;
}
+ spin_lock_irqsave(&fmdev->resp_skb_lock, flags);
if (!fmdev->resp_skb) {
+ spin_unlock_irqrestore(&fmdev->resp_skb_lock, flags);
fmerr("Response SKB is missing\n");
return -EFAULT;
}
- spin_lock_irqsave(&fmdev->resp_skb_lock, flags);
skb = fmdev->resp_skb;
fmdev->resp_skb = NULL;
spin_unlock_irqrestore(&fmdev->resp_skb_lock, flags);
--
2.22.0
From: Qiu-ji Chen <chenqiuji666(a)gmail.com>
stable inclusion
from stable-v4.19.325
commit d16109c9fdc1b8cea4fe63b42e06e926c3f68990
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBEDOW
CVE: CVE-2024-56700
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id…
--------------------------------
commit ca59f9956d4519ab18ab2270be47c6b8c6ced091 upstream.
Atomicity violation occurs when the fmc_send_cmd() function is executed
simultaneously with the modification of the fmdev->resp_skb value.
Consider a scenario where, after passing the validity check within the
function, a non-null fmdev->resp_skb variable is assigned a null value.
This results in an invalid fmdev->resp_skb variable passing the validity
check. As seen in the later part of the function, skb = fmdev->resp_skb;
when the invalid fmdev->resp_skb passes the check, a null pointer
dereference error may occur at line 478, evt_hdr = (void *)skb->data;
To address this issue, it is recommended to include the validity check of
fmdev->resp_skb within the locked section of the function. This
modification ensures that the value of fmdev->resp_skb does not change
during the validation process, thereby maintaining its validity.
This possible bug is found by an experimental static analysis tool
developed by our team. This tool analyzes the locking APIs
to extract function pairs that can be concurrently executed, and then
analyzes the instructions in the paired functions to identify possible
concurrency bugs including data races and atomicity violations.
Fixes: e8454ff7b9a4 ("[media] drivers:media:radio: wl128x: FM Driver Common sources")
Cc: stable(a)vger.kernel.org
Signed-off-by: Qiu-ji Chen <chenqiuji666(a)gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco(a)xs4all.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
Signed-off-by: dinglongwei <dinglongwei1(a)huawei.com>
---
drivers/media/radio/wl128x/fmdrv_common.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/media/radio/wl128x/fmdrv_common.c b/drivers/media/radio/wl128x/fmdrv_common.c
index 1cf4019689a5..8b8453dab660 100644
--- a/drivers/media/radio/wl128x/fmdrv_common.c
+++ b/drivers/media/radio/wl128x/fmdrv_common.c
@@ -472,11 +472,12 @@ int fmc_send_cmd(struct fmdev *fmdev, u8 fm_op, u16 type, void *payload,
jiffies_to_msecs(FM_DRV_TX_TIMEOUT) / 1000);
return -ETIMEDOUT;
}
+ spin_lock_irqsave(&fmdev->resp_skb_lock, flags);
if (!fmdev->resp_skb) {
+ spin_unlock_irqrestore(&fmdev->resp_skb_lock, flags);
fmerr("Response SKB is missing\n");
return -EFAULT;
}
- spin_lock_irqsave(&fmdev->resp_skb_lock, flags);
skb = fmdev->resp_skb;
fmdev->resp_skb = NULL;
spin_unlock_irqrestore(&fmdev->resp_skb_lock, flags);
--
2.22.0