Messages in this thread Patch in this message | | | From | Fabian Frederick <> | Subject | [PATCH 1/1 linux-next] ACPI / extlog: avoid null pointer dereference | Date | Tue, 7 Jun 2016 22:11:23 +0200 |
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extlog_l1_addr was checked after assigning flags attribute.
Signed-off-by: Fabian Frederick <fabf@skynet.be> --- drivers/acpi/acpi_extlog.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/acpi_extlog.c b/drivers/acpi/acpi_extlog.c index b3842ff..183b7b2 100644 --- a/drivers/acpi/acpi_extlog.c +++ b/drivers/acpi/acpi_extlog.c @@ -309,9 +309,10 @@ static void __exit extlog_exit(void) { set_edac_report_status(old_edac_report_status); mce_unregister_decode_chain(&extlog_mce_dec); - ((struct extlog_l1_head *)extlog_l1_addr)->flags &= ~FLAG_OS_OPTIN; - if (extlog_l1_addr) + if (extlog_l1_addr) { + ((struct extlog_l1_head *)extlog_l1_addr)->flags &= ~FLAG_OS_OPTIN; acpi_os_unmap_iomem(extlog_l1_addr, l1_size); + } if (elog_addr) acpi_os_unmap_iomem(elog_addr, elog_size); release_mem_region(elog_base, elog_size); -- 2.1.4
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