CVE-2025-22104: ibmvnic: Use kernel helpers for hex dumps

CKI Backport Botrequested to merge
redhat/red-hat-ci-tools/kernel/bot-branches/centos-stream/src/kernel/centos-stream-9:backport-RHEL-89020-centos-stream-9-main into main

JIRA: https://issues.redhat.com/browse/RHEL-89020
CVE: CVE-2025-22104

commit d93a6caab5d7d9b5ce034d75b1e1e993338e3852
Author: Nick Child <nnac123@linux.ibm.com>
Date:   Thu Mar 20 16:29:51 2025 -0500

    ibmvnic: Use kernel helpers for hex dumps
    
    Previously, when the driver was printing hex dumps, the buffer was cast
    to an 8 byte long and printed using string formatters. If the buffer
    size was not a multiple of 8 then a read buffer overflow was possible.
    
    Therefore, create a new ibmvnic function that loops over a buffer and
    calls hex_dump_to_buffer instead.
    
    This patch address KASAN reports like the one below:
      ibmvnic 30000003 env3: Login Buffer:
      ibmvnic 30000003 env3: 01000000af000000
      <...>
      ibmvnic 30000003 env3: 2e6d62692e736261
      ibmvnic 30000003 env3: 65050003006d6f63
      ==================================================================
      BUG: KASAN: slab-out-of-bounds in ibmvnic_login+0xacc/0xffc [ibmvnic]
      Read of size 8 at addr c0000001331a9aa8 by task ip/17681
      <...>
      Allocated by task 17681:
      <...>
      ibmvnic_login+0x2f0/0xffc [ibmvnic]
      ibmvnic_open+0x148/0x308 [ibmvnic]
      __dev_open+0x1ac/0x304
      <...>
      The buggy address is located 168 bytes inside of
                    allocated 175-byte region [c0000001331a9a00, c0000001331a9aaf)
      <...>
      =================================================================
      ibmvnic 30000003 env3: 000000000033766e
    
    Fixes: 032c5e82847a ("Driver for IBM System i/p VNIC protocol")
    Signed-off-by: Nick Child <nnac123@linux.ibm.com>
    Reviewed-by: Dave Marquardt <davemarq@linux.ibm.com>
    Reviewed-by: Simon Horman <horms@kernel.org>
    Link: https://patch.msgid.link/20250320212951.11142-1-nnac123@linux.ibm.com
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>```

Signed-off-by: CKI Backport Bot <cki-ci-bot+cki-gitlab-backport-bot@redhat.com>

---

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