mm/mempolicy: fix memory leak in set_mempolicy_home_node system call
When encountering any vma in the range with policy other than MPOL_BIND or MPOL_PREFERRED_MANY, an error is returned without issuing a mpol_put on the policy just allocated with mpol_dup(). This allows arbitrary users to leak kernel memory. Link: https://lkml.kernel.org/r/20221215194621.202816-1-mathieu.desnoyers@efficios.com Fixes: c6018b4b ("mm/mempolicy: add set_mempolicy_home_node syscall") Signed-off-by:Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Reviewed-by:
Randy Dunlap <rdunlap@infradead.org> Reviewed-by:
"Huang, Ying" <ying.huang@intel.com> Reviewed-by:
Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Acked-by:
Michal Hocko <mhocko@suse.com> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Feng Tang <feng.tang@intel.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Andi Kleen <ak@linux.intel.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Huang Ying <ying.huang@intel.com> Cc: <stable@vger.kernel.org> [5.17+] Signed-off-by:
Andrew Morton <akpm@linux-foundation.org>
parent
6f12be79
Please register or sign in to comment