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[PW_SID:1148295] riscv: lib: Fix address overflow due to large count values in strnlen ZBB path - #2492

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[PW_SID:1148295] riscv: lib: Fix address overflow due to large count values in strnlen ZBB path#2492
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@linux-riscv-bot linux-riscv-bot commented Aug 19, 2026

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PR for series 1148295 applied to workflow__riscv__fixes

Name: riscv: lib: Fix address overflow due to large count values in strnlen ZBB path
URL: https://patchwork.kernel.org/project/linux-riscv/list/?series=1148295
Version: 1

@uestc-gr Linux RISC-V bot
riscv: lib: Fix address overflow due to large count values in strnlen…
c2abde5 
… ZBB path

Hi all,

This patch fixes an issue in the RISC-V ZBB optimized strnlen implementation.

Problem description: When using the ZBB optimized strnlen implementation, passing very large count values (such as SIZE_MAX) can cause address overflow and return incorrect results.

This issue was observed in device-mapper tests:

sh-5.2# dmsetup create testname9 --table "0 8 zero"
sh-5.2# cat /sys/block/dm-*/dm/name
testname
sh-5.2# dmsetup remove testname9

The overflow in strnlen caused failures in string handling during device-mapper operations.

Patch summary:
- Explicitly introduce the strnlen_generic label.
- Simplify the generic implementation loop.
- Add fallback logic in strnlen_zbb to redirect to the generic path when a0 + a1 overflows.
This ensures correct behavior for large count values and SIZE_MAX cases.

Fixes: 5ba15d4 ("riscv: lib: add strnlen() implementation")
Signed-off-by: Gao Rui <gao.rui@zte.com.cn>
Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>
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linux-riscv-bot commented Aug 19, 2026

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Patch 1: "riscv: lib: Fix address overflow due to large count values in strnlen ZBB path"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 142.17 seconds
Result: PASS

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linux-riscv-bot commented Aug 19, 2026

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Patch 1: "riscv: lib: Fix address overflow due to large count values in strnlen ZBB path"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1190.93 seconds
Result: PASS

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linux-riscv-bot commented Aug 19, 2026

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Patch 1: "riscv: lib: Fix address overflow due to large count values in strnlen ZBB path"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1415.40 seconds
Result: PASS

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linux-riscv-bot commented Aug 19, 2026

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Patch 1: "riscv: lib: Fix address overflow due to large count values in strnlen ZBB path"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 26.77 seconds
Result: PASS

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linux-riscv-bot commented Aug 19, 2026

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Patch 1: "riscv: lib: Fix address overflow due to large count values in strnlen ZBB path"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 27.71 seconds
Result: PASS

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linux-riscv-bot commented Aug 19, 2026

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Patch 1: "riscv: lib: Fix address overflow due to large count values in strnlen ZBB path"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 1.67 seconds
Result: WARNING
Output:

WARNING: From:/Signed-off-by: email name mismatch: 'From: "gao.rui@zte.com.cn" <gao.rui@zte.com.cn>' != 'Signed-off-by: Gao Rui <gao.rui@zte.com.cn>'

total: 0 errors, 1 warnings, 0 checks, 43 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Commit c2abde56b29f ("riscv: lib: Fix address overflow due to large count values in strnlen ZBB path") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT CAMELCASE COMMIT_LOG_LONG_LINE GIT_COMMIT_ID MACRO_ARG_REUSE NO_AUTHOR_SIGN_OFF

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
total: 0 errors, 1 warnings, 0 checks, 43 lines checked
WARNING: From:/Signed-off-by: email name mismatch: 'From: "gao.rui@zte.com.cn" <gao.rui@zte.com.cn>' != 'Signed-off-by: Gao Rui <gao.rui@zte.com.cn>'

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linux-riscv-bot commented Aug 19, 2026

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Patch 1: "riscv: lib: Fix address overflow due to large count values in strnlen ZBB path"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 87.47 seconds
Result: PASS

@linux-riscv-bot

linux-riscv-bot commented Aug 19, 2026

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Patch 1: "riscv: lib: Fix address overflow due to large count values in strnlen ZBB path"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.25 seconds
Result: PASS

@linux-riscv-bot

linux-riscv-bot commented Aug 19, 2026

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Patch 1: "riscv: lib: Fix address overflow due to large count values in strnlen ZBB path"
kdoc
Desc: Detects for kdoc errors
Duration: 0.85 seconds
Result: PASS

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linux-riscv-bot commented Aug 19, 2026

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Patch 1: "riscv: lib: Fix address overflow due to large count values in strnlen ZBB path"
module-param
Desc: Detect module_param changes
Duration: 0.27 seconds
Result: PASS

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linux-riscv-bot commented Aug 19, 2026

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Patch 1: "riscv: lib: Fix address overflow due to large count values in strnlen ZBB path"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.30 seconds
Result: PASS

@linux-riscv-bot

linux-riscv-bot commented Aug 19, 2026

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Patch 1: "riscv: lib: Fix address overflow due to large count values in strnlen ZBB path"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.30 seconds
Result: PASS

@linux-riscv-bot
linux-riscv-bot deleted the pw1148295 branch August 21, 2026 00:52
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