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acpi, nfit: fix register dimm error handling
commit23fbd7c70a
upstream. A NULL pointer reference kernel bug was observed when acpi_nfit_add_dimm() called in acpi_nfit_register_dimms() failed. This error path does not set nfit_mem->nvdimm, but the 2nd list_for_each_entry() loop in the function assumes it's always set. Add a check to nfit_mem->nvdimm. Fixes:ba9c8dd3c2
("acpi, nfit: add dimm device notification support") Signed-off-by: Toshi Kani <toshi.kani@hpe.com> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1618,6 +1618,9 @@ static int acpi_nfit_register_dimms(struct acpi_nfit_desc *acpi_desc)
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struct kernfs_node *nfit_kernfs;
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nvdimm = nfit_mem->nvdimm;
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if (!nvdimm)
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continue;
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nfit_kernfs = sysfs_get_dirent(nvdimm_kobj(nvdimm)->sd, "nfit");
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if (nfit_kernfs)
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nfit_mem->flags_attr = sysfs_get_dirent(nfit_kernfs,
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