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CVE-2023-23005: mm/demotion: fix NULL vs IS_ERR checking in memory_tier_init · torvalds/linux@4a625ce
** DISPUTED ** In the Linux kernel before 6.2, mm/memory-tiers.c misinterprets the alloc_memory_type return value (expects it to be NULL in the error case, whereas it is actually an error pointer). NOTE: this is disputed by third parties because there are no realistic cases in which a user can cause the alloc_memory_type error case to be reached.
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mm/demotion: fix NULL vs IS_ERR checking in memory_tier_init
alloc_memory_type() returns error pointers on error instead of NULL. Use IS_ERR() to check the return value to fix this.
Link: https://lkml.kernel.org/r/20221110030751.1627266-1-linmq006@gmail.com Fixes: 7b88bda (“mm/demotion/dax/kmem: set node’s abstract distance to MEMTIER_DEFAULT_DAX_ADISTANCE”) Signed-off-by: Miaoqian Lin linmq006@gmail.com Reviewed-by: “Huang, Ying” ying.huang@intel.com Cc: Aneesh Kumar K.V aneesh.kumar@linux.ibm.com Cc: Wei Xu weixugc@google.com Signed-off-by: Andrew Morton akpm@linux-foundation.org
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