In the Linux kernel, the following vulnerability has been resolved:
net: dsa: fix panic on shutdown if multi-chip tree failed to probe
DSA probing is atypical because a tree of devices must probe all at
once, so out of N switches which call dsa_tree_setup_routing_table()
during probe, for (N - 1) of them, "complete" will return false and they
will exit probing early. The Nth switch will set up the whole tree on
their behalf.
The implication is that for (N - 1) switches, the driver binds to the
device successfully, without doing anything. When the driver is bound,
the ->shutdown() method may run. But if the Nth switch has failed to
initialize the tree, there is nothing to do for the (N - 1) driver
instances, since the slave devices have not been created, etc. Moreover,
dsa_switch_shutdown() expects that the calling @ds has been in fact
initialized, so it jumps at dereferencing the various data structures,
which is incorrect.
Avoid the ensuing NULL pointer dereferences by simply checking whether
the Nth switch has previously set "ds->setup = true" for the switch
which is currently shutting down. The entire setup is serialized under
dsa2_mutex which we already hold.
Metrics
Affected Vendors & Products
| Vendors | Products |
|---|---|
| Linux |
|
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No data.
References
History
Fri, 28 Feb 2025 14:00:00 +0000
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threat_severity
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cvssV3_1
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Wed, 26 Feb 2025 02:15:00 +0000
| Type | Values Removed | Values Added |
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| Description | In the Linux kernel, the following vulnerability has been resolved: net: dsa: fix panic on shutdown if multi-chip tree failed to probe DSA probing is atypical because a tree of devices must probe all at once, so out of N switches which call dsa_tree_setup_routing_table() during probe, for (N - 1) of them, "complete" will return false and they will exit probing early. The Nth switch will set up the whole tree on their behalf. The implication is that for (N - 1) switches, the driver binds to the device successfully, without doing anything. When the driver is bound, the ->shutdown() method may run. But if the Nth switch has failed to initialize the tree, there is nothing to do for the (N - 1) driver instances, since the slave devices have not been created, etc. Moreover, dsa_switch_shutdown() expects that the calling @ds has been in fact initialized, so it jumps at dereferencing the various data structures, which is incorrect. Avoid the ensuing NULL pointer dereferences by simply checking whether the Nth switch has previously set "ds->setup = true" for the switch which is currently shutting down. The entire setup is serialized under dsa2_mutex which we already hold. | |
| Title | net: dsa: fix panic on shutdown if multi-chip tree failed to probe | |
| References |
|
MITRE
Status: PUBLISHED
Assigner: Linux
Published: 2025-02-26T01:55:40.082Z
Updated: 2025-05-04T08:32:07.310Z
Reserved: 2025-02-26T01:49:39.288Z
Link: CVE-2022-49195
Vulnrichment
No data.
NVD
Status : Received
Published: 2025-02-26T07:00:56.580
Modified: 2025-02-26T07:00:56.580
Link: CVE-2022-49195
Redhat