[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [PATCH v2 0/2] x86: Check return values for early memory/IO remap calls
On 11/10/22 10:45, Ross Philipson wrote: While sending an earlier patch set it was discovered that there are a number of places in early x86 code were the functions early_memremap() and early_ioremap() are called but the returned pointer is not checked for NULL. Since NULL can be returned for a couple of reasons, the return value should be checked for NULL. This set fixes the places where the checks were missing. It was not always clear what the best failure mode should be when NULL is detected. In modules where other places tended to pr_warn or panic e.g., the same was done for the checks. In other places it was based on how significantly fatal the failure would end up being. The review process may point out places where this should be changed. Borislav,I just wanted to get your thoughts here since it was by your prompting that I sent this second patch set to make checking of return values from early_memremap() and early_ioremap() consistent. I have gotten Reviewed-by's from some of the maintainers in specific areas that they approve of the return handling. I also got two replies basically questioning the underlying approach. I replied that I basically did what you asked me to do. I have not heard back. How would you like me to proceed? Thanks, Ross Philipson Changes in v2: - Added notes in comments about why panic() was used in some cases and the fact that maintainers approved the usage. - Added pr_fmt macros in changed files to allow proper usage of pr_* printing macros. Ross Philipson (2): x86: Check return values from early_memremap calls x86: Check return values from early_ioremap calls arch/x86/kernel/apic/x2apic_uv_x.c | 2 ++ arch/x86/kernel/devicetree.c | 13 ++++++++++ arch/x86/kernel/e820.c | 12 +++++++-- arch/x86/kernel/early_printk.c | 2 ++ arch/x86/kernel/jailhouse.c | 6 +++++ arch/x86/kernel/mpparse.c | 51 ++++++++++++++++++++++++++++---------- arch/x86/kernel/setup.c | 19 +++++++++++--- arch/x86/kernel/vsmp_64.c | 3 +++ arch/x86/xen/enlighten_hvm.c | 2 ++ arch/x86/xen/mmu_pv.c | 8 ++++++ arch/x86/xen/setup.c | 2 ++ 11 files changed, 102 insertions(+), 18 deletions(-)
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