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x86/amd_node: Fix potential NULL pointer dereference

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amd_smn_read/write() are exported functions around __amd_smn_rw(), so
they are always available even if amd_smn_init() fails. In that case,
'amd_roots' is NULL and __amd_smn_rw() will access uninitialized memory.

Then, commit:

  8351845307 ("x86/amd_node: Add SMN offsets to exclusive region access")

added the 'smn_exclusive' flag, which indicated the calls to
pci_request_config_region_exclusive() succeeded, to prevent
concurrent userspace access.

Commit:

  0a4b61d9c2 ("x86/amd_node: Fix AMD root device caching")

re-ordered initialization so pci_request_config_region_exclusive() is
called earlier and a failure exits amd_smn_init() before allocating
'amd_roots'. The setting of 'smn_exclusive' moved to the end of
amd_smn_init(), after 'amd_roots' is allocated. It became redundant
and can be removed.

Replace 'smn_exclusive' with directly checking 'amd_roots', to fix a
potential NULL pointer dereference and to simplify the logic.

  [ bp: Reorg commit message, touchup comment. ]
  [ mingo: Rebase & further touchups. ]

Fixes: 77466b798d ("x86/amd_node: Remove dependency on AMD_NB")
Signed-off-by: Jason Andryuk <jason.andryuk@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Yazen Ghannam <yazen.ghannam@amd.com>
Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260825214805.39148-3-jason.andryuk@amd.com
This commit is contained in:
Jason Andryuk
2026-08-25 17:48:03 -04:00
committed by Ingo Molnar
parent 72bd92bd81
commit aefdbd574a
1 changed files with 8 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
arch/x86/kernel/amd_node.c
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@@ -38,7 +38,6 @@ static struct pci_dev **amd_roots;
/* Protect the PCI config register pairs used for SMN. */
static DEFINE_MUTEX(smn_mutex);
static bool smn_exclusive;
#define SMN_INDEX_OFFSET 0x60
#define SMN_DATA_OFFSET 0x64
@@ -91,11 +90,16 @@ static int __amd_smn_rw(u8 i_off, u8 d_off, u16 node, u32 address, u32 *value, b
if (node >= amd_num_nodes())
return err;
root = amd_roots[node];
if (!root)
/*
* Uninitialized amd_roots indicates pci_request_config_region_exclusive()
* didn't run or failed and thus the kernel cannot rely on having
* exclusive access to SMN registers so prevent that.
*/
if (!amd_roots)
return err;
if (!smn_exclusive)
root = amd_roots[node];
if (!root)
return err;
guard(mutex)(&smn_mutex);
@@ -313,8 +317,6 @@ static int __init amd_smn_init(void)
debugfs_create_file("value", 0600, debugfs_dir, NULL, &smn_value_fops);
}
smn_exclusive = true;
return 0;
}