title: net: atlantic: Fix DMA mapping for PTP hwts ring
description: In the Linux kernel, the following vulnerability has been resolved:
net: atlantic: Fix DMA mapping for PTP hwts ring
Function aq_ring_hwts_rx_alloc() maps extra AQ_CFG_RXDS_DEF bytes
for PTP HWTS ring but then generic aq_ring_free() does not take this
into account.
Create and use a specific function to free HWTS ring to fix this
issue.
Trace:
[  215.351607] ------------[ cut here ]------------
[  215.351612] DMA-API: atlantic 0000:4b:00.0: device driver frees DMA memory with different size [device address=0x00000000fbdd0000] [map size=34816 bytes] [unmap size=32768 bytes]
[  215.351635] WARNING: CPU: 33 PID: 10759 at kernel/dma/debug.c:988 check_unmap+0xa6f/0x2360
...
[  215.581176] Call Trace:
[  215.583632]  <TASK>
[  215.585745]  ? show_trace_log_lvl+0x1c4/0x2df
[  215.590114]  ? show_trace_log_lvl+0x1c4/0x2df
[  215.594497]  ? debug_dma_free_coherent+0x196/0x210
[  215.599305]  ? check_unmap+0xa6f/0x2360
[  215.603147]  ? __warn+0xca/0x1d0
[  215.606391]  ? check_unmap+0xa6f/0x2360
[  215.610237]  ? report_bug+0x1ef/0x370
[  215.613921]  ? handle_bug+0x3c/0x70
[  215.617423]  ? exc_invalid_op+0x14/0x50
[  215.621269]  ? asm_exc_invalid_op+0x16/0x20
[  215.625480]  ? check_unmap+0xa6f/0x2360
[  215.629331]  ? mark_lock.part.0+0xca/0xa40
[  215.633445]  debug_dma_free_coherent+0x196/0x210
[  215.638079]  ? __pfx_debug_dma_free_coherent+0x10/0x10
[  215.643242]  ? slab_free_freelist_hook+0x11d/0x1d0
[  215.648060]  dma_free_attrs+0x6d/0x130
[  215.651834]  aq_ring_free+0x193/0x290 [atlantic]
[  215.656487]  aq_ptp_ring_free+0x67/0x110 [atlantic]
...
[  216.127540] ---[ end trace 6467e5964dd2640b ]---
[  216.132160] DMA-API: Mapped at:
[  216.132162]  debug_dma_alloc_coherent+0x66/0x2f0
[  216.132165]  dma_alloc_attrs+0xf5/0x1b0
[  216.132168]  aq_ring_hwts_rx_alloc+0x150/0x1f0 [atlantic]
[  216.132193]  aq_ptp_ring_alloc+0x1bb/0x540 [atlantic]
[  216.132213]  aq_nic_init+0x4a1/0x760 [atlantic]
affected:
{
product: Linux
vendor: Linux
defaultStatus: unaffected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions:
version: 94ad94558b0f, lessThan: 466ceebe48cb, status: affected, versionType: git
version: 94ad94558b0f, lessThan: 004fe5b7f592, status: affected, versionType: git
version: 94ad94558b0f, lessThan: e42e334c6455, status: affected, versionType: git
version: 94ad94558b0f, lessThan: 2e7d3b67630d, status: affected, versionType: git
}
{
product: Linux
vendor: Linux
defaultStatus: affected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions:
version: 5.5, status: affected
version: 0, lessThan: 5.5, status: unaffected, versionType: custom
version: 6.1.78, lessThanOrEqual: 6.1.*, status: unaffected, versionType: custom
version: 6.6.17, lessThanOrEqual: 6.6.*, status: unaffected, versionType: custom
version: 6.7.5, lessThanOrEqual: 6.7.*, status: unaffected, versionType: custom
version: 6.8, lessThanOrEqual: *, status: unaffected, versionType: original_commit_for_fix
}
