1. 01 Dec, 2019 38 commits
  2. 24 Nov, 2019 2 commits
    • Greg Kroah-Hartman's avatar
      Linux 4.19.86 · 14260788
      Greg Kroah-Hartman authored
      14260788
    • Reinette Chatre's avatar
      x86/resctrl: Fix rdt_find_domain() return value and checks · 2e1f151c
      Reinette Chatre authored
      [ Upstream commit 52eb7433 ]
      
      rdt_find_domain() returns an ERR_PTR() that is generated from a provided
      domain id when the value is negative.
      
      Care needs to be taken when creating an ERR_PTR() from this value
      because a subsequent check using IS_ERR() expects the error to
      be within the MAX_ERRNO range. Using an invalid domain id as an
      ERR_PTR() does work at this time since this is currently always -1.
      Using this undocumented assumption is fragile since future users of
      rdt_find_domain() may not be aware of thus assumption.
      
      Two related issues are addressed:
      
      - Ensure that rdt_find_domain() always returns a valid error value by
      forcing the error to be -ENODEV when a negative domain id is provided.
      
      - In a few instances the return value of rdt_find_domain() is just
      checked for NULL - fix these to include a check of ERR_PTR.
      
      Fixes: d89b7379 ("x86/intel_rdt/cqm: Add mon_data")
      Fixes: 521348b0 ("x86/intel_rdt: Introduce utility to obtain CDP peer")
      Signed-off-by: default avatarReinette Chatre <reinette.chatre@intel.com>
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Tony Luck <tony.luck@intel.com>
      Cc: fenghua.yu@intel.com
      Cc: gavin.hindman@intel.com
      Cc: jithu.joseph@intel.com
      Cc: x86-ml <x86@kernel.org>
      Link: https://lkml.kernel.org/r/b88cd4ff6a75995bf8db9b0ea546908fe50f69f3.1544479852.git.reinette.chatre@intel.comSigned-off-by: default avatarSasha Levin <sashal@kernel.org>
      2e1f151c