Messages in this thread Patch in this message | | | From | Wei Yang <> | Subject | [PATCH 1/3] x86/numa_emulation: fix potential memory leak | Date | Tue, 11 Apr 2017 00:56:50 +0800 |
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numa_emulation() needs to allocate a space for phys_dist[] temporarily, while current code may miss to release this when dfl_phys_nid == NUMA_NO_NODE. It is observed in code review instead of in a real case.
This patch fixes this by re-order the code path.
Signed-off-by: Wei Yang <richard.weiyang@gmail.com> --- arch/x86/mm/numa_emulation.c | 36 ++++++++++++++++++------------------ 1 file changed, 18 insertions(+), 18 deletions(-)
diff --git a/arch/x86/mm/numa_emulation.c b/arch/x86/mm/numa_emulation.c index a8f90ce3dedf..eb017c816de6 100644 --- a/arch/x86/mm/numa_emulation.c +++ b/arch/x86/mm/numa_emulation.c @@ -353,6 +353,24 @@ void __init numa_emulation(struct numa_meminfo *numa_meminfo, int numa_dist_cnt) goto no_emu; } + /* + * Determine the max emulated nid and the default phys nid to use + * for unmapped nodes. + */ + max_emu_nid = 0; + dfl_phys_nid = NUMA_NO_NODE; + for (i = 0; i < ARRAY_SIZE(emu_nid_to_phys); i++) { + if (emu_nid_to_phys[i] != NUMA_NO_NODE) { + max_emu_nid = i; + if (dfl_phys_nid == NUMA_NO_NODE) + dfl_phys_nid = emu_nid_to_phys[i]; + } + } + if (dfl_phys_nid == NUMA_NO_NODE) { + pr_warning("NUMA: Warning: can't determine default physical node, disabling emulation\n"); + goto no_emu; + } + /* copy the physical distance table */ if (numa_dist_cnt) { u64 phys; @@ -372,24 +390,6 @@ void __init numa_emulation(struct numa_meminfo *numa_meminfo, int numa_dist_cnt) node_distance(i, j); } - /* - * Determine the max emulated nid and the default phys nid to use - * for unmapped nodes. - */ - max_emu_nid = 0; - dfl_phys_nid = NUMA_NO_NODE; - for (i = 0; i < ARRAY_SIZE(emu_nid_to_phys); i++) { - if (emu_nid_to_phys[i] != NUMA_NO_NODE) { - max_emu_nid = i; - if (dfl_phys_nid == NUMA_NO_NODE) - dfl_phys_nid = emu_nid_to_phys[i]; - } - } - if (dfl_phys_nid == NUMA_NO_NODE) { - pr_warning("NUMA: Warning: can't determine default physical node, disabling emulation\n"); - goto no_emu; - } - /* commit */ *numa_meminfo = ei; -- 2.11.0
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