linux-kernel - [PATCH v1 0/1] fsi: cfam: clamp chunk length to remaining count

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Message-ID: <20260116040140.65394-1-chaitanyamishra.ai@gmail.com>
Date: Fri, 16 Jan 2026 09:31:39 +0530
From: Chaitanya Mishra <chaitanyamishra.ai@...il.com>
To: Eddie James <eajames@...ux.ibm.com>
Cc: Ninad Palsule <ninad@...ux.ibm.com>,
	linux-fsi@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org,
	Chaitanya Mishra <chaitanyamishra.ai@...il.com>
Subject: [PATCH v1 0/1] fsi: cfam: clamp chunk length to remaining count

This series fixes cfam read/write chunk sizing to respect the remaining
count, preventing over-copy past the user buffer when the request is not
4-byte aligned.

Testing:
- AWS EC2 t3.large, Ubuntu 22.04 (jammy)
- defconfig + OF + FSI, W=1 build of drivers/fsi/fsi-core.o

Commands:
  make defconfig
  scripts/config -e OF
  scripts/config -e FSI
  make olddefconfig
  make -j$(nproc) W=1 drivers/fsi/fsi-core.o

Log (tail):
  UPD     include/generated/timeconst.h
  CC      kernel/bounds.s
  CHKSHA1 include/linux/atomic/atomic-arch-fallback.h
  CHKSHA1 include/linux/atomic/atomic-instrumented.h
  CHKSHA1 include/linux/atomic/atomic-long.h
  UPD     include/generated/bounds.h
  CC      arch/x86/kernel/asm-offsets.s
  UPD     include/generated/asm-offsets.h
  CC      kernel/sched/rq-offsets.s
  CC      /home/ubuntu/linux/tools/objtool/builtin-check.o
  UPD     include/generated/rq-offsets.h
  CALL    scripts/checksyscalls.sh
  CC      /home/ubuntu/linux/tools/objtool/elf.o
  CC      /home/ubuntu/linux/tools/objtool/objtool.o
  CC      /home/ubuntu/linux/tools/objtool/orc_gen.o
  CC      /home/ubuntu/linux/tools/objtool/orc_dump.o
  CC      /home/ubuntu/linux/tools/objtool/libstring.o
  CC      /home/ubuntu/linux/tools/objtool/libctype.o
  CC      /home/ubuntu/linux/tools/objtool/str_error_r.o
  CC      /home/ubuntu/linux/tools/objtool/librbtree.o
  CC      /home/ubuntu/linux/tools/objtool/signal.o
  LD      /home/ubuntu/linux/tools/objtool/objtool-in.o
  LINK    /home/ubuntu/linux/tools/objtool/objtool
  CC      drivers/fsi/fsi-core.o

Chaitanya Mishra (1):
  fsi: cfam: clamp chunk length to remaining count

 drivers/fsi/fsi-core.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

-- 
2.50.1 (Apple Git-155)