PCI/P2PDMA: Safely terminate ACS redirect lists

seq_buf marks an overflow by setting len to size + 1. The ACS diagnostic
path unconditionally writes a terminator to buffer[len - 1], so a path with
enough ACS ports to fill the 128-byte buffer writes one byte beyond the
buffer when verbose diagnostics are requested.

Use seq_buf_str() to terminate truncated output safely and remove the final
semicolon only when the buffer did not overflow.

Fixes: 52916982af48 ("PCI/P2PDMA: Support peer-to-peer memory")
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Tushar Dave <tdave@nvidia.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://patch.msgid.link/20260830-batch-p2p-fixes-v1-4-5044e8dfbe2e@nvidia.com

0 files changed, 0 insertions, 0 deletions