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[PW_SID:1121108] [v4] riscv: Prevent NULL pointer dereference in machine_kexec_prepare#2209

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[PW_SID:1121108] [v4] riscv: Prevent NULL pointer dereference in machine_kexec_prepare#2209
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@linux-riscv-bot linux-riscv-bot commented Jul 3, 2026

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PR for series 1121108 applied to workflow__riscv__fixes

Name: [v4] riscv: Prevent NULL pointer dereference in machine_kexec_prepare
URL: https://patchwork.kernel.org/project/linux-riscv/list/?series=1121108
Version: 4

Linux RISC-V bot and others added 2 commits July 1, 2026 03:48
Adding CI files
89be0ce
@liutgnu
riscv: Prevent NULL pointer dereference in machine_kexec_prepare
c6830d7 
A NULL pointer dereference issue is noticed in riscv's machine_kexec_prepare(),
where image->segment[i].buf might be NULL and copied unchecked.

The NULL buf comes from ima_add_kexec_buffer(), where kbuf is added by
kexec_add_buffer(), but kbuf.buffer is NULL, then it is copied without
a check in machine_kexec_prepare().

Relevant path:

  kexec_file_load
    -> kimage_file_alloc_init()
       -> kimage_file_prepare_segments()
          -> ima_add_kexec_buffer()
             -> kexec_add_buffer()
    -> machine_kexec_prepare()
       -> memcpy()

Address this by adding a check before the data copy attempt.

Fixes: b7fb4d7 ("RISC-V: use memcpy for kexec_file mode")
Cc: stable@vger.kernel.org
Closes: https://lore.kernel.org/kexec/CAO7dBbVftLUhd2qrh7hmijTB3PEPfZAhykCGqEfrPoOcSrrj-w@mail.gmail.com/
Acked-by: Baoquan He <bhe@redhat.com>
Acked-by: Pratyush Yadav <pratyush@kernel.org>
Reviewed-by: Nutty Liu <nutty.liu@hotmail.com>
Signed-off-by: Tao Liu <ltao@redhat.com>
Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>
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linux-riscv-bot commented Jul 3, 2026

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Patch 1: "[v4] riscv: Prevent NULL pointer dereference in machine_kexec_prepare"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 145.56 seconds
Result: PASS

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linux-riscv-bot commented Jul 3, 2026

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Patch 1: "[v4] riscv: Prevent NULL pointer dereference in machine_kexec_prepare"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1395.78 seconds
Result: PASS

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linux-riscv-bot commented Jul 3, 2026

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Patch 1: "[v4] riscv: Prevent NULL pointer dereference in machine_kexec_prepare"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1733.34 seconds
Result: PASS

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linux-riscv-bot commented Jul 3, 2026

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Patch 1: "[v4] riscv: Prevent NULL pointer dereference in machine_kexec_prepare"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 28.92 seconds
Result: PASS

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linux-riscv-bot commented Jul 3, 2026

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Patch 1: "[v4] riscv: Prevent NULL pointer dereference in machine_kexec_prepare"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 30.08 seconds
Result: PASS

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linux-riscv-bot commented Jul 3, 2026

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Patch 1: "[v4] riscv: Prevent NULL pointer dereference in machine_kexec_prepare"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 0.78 seconds
Result: PASS

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linux-riscv-bot commented Jul 3, 2026

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Patch 1: "[v4] riscv: Prevent NULL pointer dereference in machine_kexec_prepare"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 89.02 seconds
Result: PASS

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linux-riscv-bot commented Jul 3, 2026

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Patch 1: "[v4] riscv: Prevent NULL pointer dereference in machine_kexec_prepare"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.24 seconds
Result: PASS

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linux-riscv-bot commented Jul 3, 2026

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Patch 1: "[v4] riscv: Prevent NULL pointer dereference in machine_kexec_prepare"
kdoc
Desc: Detects for kdoc errors
Duration: 0.91 seconds
Result: PASS

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linux-riscv-bot commented Jul 3, 2026

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Patch 1: "[v4] riscv: Prevent NULL pointer dereference in machine_kexec_prepare"
module-param
Desc: Detect module_param changes
Duration: 0.25 seconds
Result: PASS

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linux-riscv-bot commented Jul 3, 2026

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Patch 1: "[v4] riscv: Prevent NULL pointer dereference in machine_kexec_prepare"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.28 seconds
Result: PASS

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linux-riscv-bot commented Jul 3, 2026

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Patch 1: "[v4] riscv: Prevent NULL pointer dereference in machine_kexec_prepare"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.30 seconds
Result: PASS

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linux-riscv-bot force-pushed the workflow__riscv__fixes branch from 89be0ce to dc5ff20 Compare July 7, 2026 03:25
@linux-riscv-bot
linux-riscv-bot deleted the pw1121108 branch July 7, 2026 03:26
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