git: ena(4): Fix possible NULL deref in ena_com_create_and_store_tx_meta_desc()

[Aaron LI]

commit eed3ec1e51f9c4255f1f5aafe8683d60cccfedf2
Author: Aaron LI <aly at aaronly.me>
Date:   Tue Oct 13 16:40:37 2026 +0800

    ena(4): Fix possible NULL deref in ena_com_create_and_store_tx_meta_desc()
    
    get_sq_desc() may return NULL, so passing the return value to memset()
    would cause a NULL deref.  GCC 12.5 caught this and gave a
    -Warray-bounds warning:
    
    ```
    In file included from /usr/src/sys/dev/virtual/amazon/ena/ena-com/ena_plat.h:40,
                     from /usr/src/sys/dev/virtual/amazon/ena/ena-com/ena_com.h:38,
                     from /usr/src/sys/dev/virtual/amazon/ena/ena-com/ena_eth_com.h:40,
                     from /usr/src/sys/dev/virtual/amazon/ena/ena-com/ena_eth_com.c:34:
    In function 'ena_com_create_and_store_tx_meta_desc',
        inlined from 'ena_com_prepare_tx' at /usr/src/sys/dev/virtual/amazon/ena/ena-com/ena_eth_com.c:409:3:
    dragonfly/sys/systm.h:268:9: warning: '__builtin_memset' offset [0, 11] is out of the bounds [0, 0] [-Warray-bounds]
      268 |         __builtin_memset(__DEQUALIFY(void *, (ptr)), (c), (len))
          |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /usr/src/sys/dev/virtual/amazon/ena/ena-com/ena_eth_com.c:295:9: note: in expansion of macro 'memset'
      295 |         memset(meta_desc, 0x0, sizeof(struct ena_eth_io_tx_meta_desc));
          |         ^~~~~~
    ```
    
    Fix it by porting the minimal changes from FreeBSD.

Summary of changes:
 sys/dev/virtual/amazon/ena/ena-com/ena_eth_com.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/eed3ec1e51f9c4255f1f5aafe8683d60cccfedf2


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