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In the Linux kernel, the following vulnerability has been resolved:
s390/qeth: fix NULL deref in qeth_clear_working_pool_list()
When qeth_set_online() calls qeth_clear_working_pool_list() to roll back after an error exit from qeth_hardsetup_card(), we are at risk of accessing card->qdio.in_q before it was allocated by qeth_alloc_qdio_queues() via qeth_mpc_initialize().
qeth_clear_working_pool_list() then dereferences NULL, and by writing to queue->bufs[i].pool_entry scribbles all over the CPU's lowcore. Resulting in a crash when those lowcore areas are used next (eg. on the next machine-check interrupt).
Such a scenario would typically happen when the device is first set online and its queues aren't allocated yet. An early IO error or certain misconfigs (eg. mismatched transport mode, bad portno) then cause us to error out from qeth_hardsetup_card() with card->qdio.in_q still being NULL.
Fix it by checking the pointer for NULL before accessing it.
Note that we also have (rare) paths inside qeth_mpc_initialize() where a configuration change can cause us to free the existing queues, expecting that subsequent code will allocate them again. If we then error out before that re-allocation happens, the same bug occurs.
Root-caused-by: Heiko Carstens <[email protected]>
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 30, 2024 | May 21, 2024 |
| Suse | — | Upgrade dtb-freescaleUpgrade dtb-marvellUpgrade kernel-debugUpgrade kernel-64kb-optionalUpgrade ocfs2-kmp-azureUpgrade kernel-default-develUpgrade kernel-source-vanillaUpgrade kernel-kvmsmall-develUpgrade kernel-azure-baseUpgrade kernel-kvmsmall-livepatch-develUpgrade kernel-debug-vdsoUpgrade kernel-source-rtUpgrade kernel-rt_debug-develUpgrade dtb-hisiliconUpgrade kselftests-kmp-64kbUpgrade kernel-syms-azureUpgrade dtb-amazonUpgrade dtb-amdUpgrade gfs2-kmp-defaultUpgrade kernel-debug-develUpgrade ocfs2-kmp-64kbUpgrade dtb-allwinnerUpgrade kernel-default-livepatchUpgrade ocfs2-kmp-defaultUpgrade dtb-caviumUpgrade dtb-broadcomUpgrade kernel-rt-optionalUpgrade kernel-64kbUpgrade kernel-azure-optionalUpgrade kernel-devel-azureUpgrade gfs2-kmp-rtUpgrade kernel-source-azureUpgrade dlm-kmp-64kbUpgrade kernel-docs-htmlUpgrade kernel-default-vdsoUpgrade kernel-sourceUpgrade kernel-rt-vdsoUpgrade kernel-preempt-develUpgrade reiserfs-kmp-defaultUpgrade cluster-md-kmp-azureUpgrade kernel-azure-extraUpgrade kernel-kvmsmallUpgrade kernel-zfcpdumpUpgrade kernel-rt_debugUpgrade gfs2-kmp-64kbUpgrade dtb-renesasUpgrade kernel-64kb-livepatch-develUpgrade dtb-appleUpgrade kernel-azureUpgrade gfs2-kmp-azureUpgrade kernel-azure-livepatch-develUpgrade kernel-rt-extraUpgrade dtb-exynosUpgrade dtb-lgUpgrade kernel-kvmsmall-vdsoUpgrade dtb-alteraUpgrade kernel-obs-buildUpgrade kselftests-kmp-azureUpgrade reiserfs-kmp-64kbUpgrade kselftests-kmp-rtUpgrade kernel-default-baseUpgrade cluster-md-kmp-rtUpgrade dtb-sprdUpgrade dtb-socionextUpgrade kernel-azure-develUpgrade kselftests-kmp-defaultUpgrade kernel-defaultUpgrade dtb-amlogicUpgrade kernel-debug-livepatch-develUpgrade kernel-rt-develUpgrade ocfs2-kmp-rtUpgrade kernel-macrosUpgrade dtb-nvidiaUpgrade kernel-obs-qaUpgrade dlm-kmp-azureUpgrade kernel-rt-livepatchUpgrade dtb-xilinxUpgrade dtb-rockchipUpgrade kernel-symsUpgrade kernel-rt_debug-vdsoUpgrade kernel-default-extraUpgrade kernel-docsUpgrade kernel-default-livepatch-develUpgrade kernel-devel-rtUpgrade dtb-armUpgrade kernel-default-base-rebuildUpgrade kernel-preemptUpgrade cluster-md-kmp-defaultUpgrade reiserfs-kmp-azureUpgrade dtb-apmUpgrade reiserfs-kmp-rtUpgrade dlm-kmp-defaultUpgrade kernel-rt_debug-livepatch-develUpgrade kernel-default-optionalUpgrade dtb-qcomUpgrade cluster-md-kmp-64kbUpgrade kernel-rtUpgrade kernel-azure-vdsoUpgrade kernel-64kb-develUpgrade kernel-rt-livepatch-develUpgrade dtb-mediatekUpgrade kernel-64kb-extraUpgrade kernel-syms-rtUpgrade kernel-develUpgrade dlm-kmp-rtUpgrade kernel-default-man | Aug 9, 2024 | May 21, 2024 |
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