[GIT PULL] kgdb changes for v7.4

[Daniel Thompson]

The following changes since commit 24a19b953e2a3d0ea5a8c4951a0ab8f32720c907:

  Linux 7.3-rc7 (2026-10-11 20:04:55 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux.git/ tags/kgdb-7.4-rc1

for you to fetch changes up to 9ca9e8c857b55a081d5a1f8039b27cbb4d646b49:

  kgdb: Fix buffer overflow in the qRcmd packet handler (2026-10-28 16:55:40 +0000)

----------------------------------------------------------------
kgdb patches for 7.4

Varied updates this cycle. Naveen Kumar Chaudhary fixed a memory leak
when the environment is already full, eliminated to weird historical
cruft (CMD_BUFLEN having different values in different files) and
removed some dead code. Fang Xieyan tackled a family of related
buffer overflows in the gdb remote protocol parsing (great fixes
from a defensive coding point of view but not security relavent;
gdb can already do anything it wants to).

Signed-off-by: Daniel Thompson (RISCstar) <danielt@xxxxxxxxxx>

----------------------------------------------------------------
Fang Xieyan (3):
      kgdb: Fix buffer overflow in the 'm' packet handler
      kgdb: Fix buffer overflow in the 'M' and 'X' packet handlers
      kgdb: Fix buffer overflow in the qRcmd packet handler

Naveen Kumar Chaudhary (3):
      kdb: fix memory leak in kdb_setenv() when environment is full
      kdb: unify CMD_BUFLEN definition into kdb_private.h
      kgdb: remove unreachable return in kgdb_reenter_check()

 kernel/debug/debug_core.c      |  2 --
 kernel/debug/gdbstub.c         | 55 ++++++++++++++++++++++++++++++++++++------
 kernel/debug/kdb/kdb_io.c      |  1 -
 kernel/debug/kdb/kdb_main.c    |  7 +++---
 kernel/debug/kdb/kdb_private.h |  3 ++-
 5 files changed, 52 insertions(+), 16 deletions(-)