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linux/tools/lib/subcmd
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hupu c094712e40 perf subcmd: avoid crash in exclude_cmds when excludes is empty 
[ Upstream commit a5edf3550f ]

When cross-compiling the perf tool for ARM64, `perf help` may crash
with the following assertion failure:

  help.c:122: exclude_cmds: Assertion `cmds->names[ci] == NULL' failed.

This happens when the perf binary is not named exactly "perf" or when
multiple "perf-*" binaries exist in the same directory. In such cases,
the `excludes` command list can be empty, which leads to the final
assertion in exclude_cmds() being triggered.

Add a simple guard at the beginning of exclude_cmds() to return early
if excludes->cnt is zero, preventing the crash.

Signed-off-by: hupu <hupu.gm@gmail.com>
Reported-by: Guilherme Amadio <amadio@gentoo.org>
Reviewed-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20250909094953.106706-1-amadio@gentoo.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-10-19 16:21:27 +02:00
..
Build perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
exec-cmd.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
exec-cmd.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
help.c perf subcmd: avoid crash in exclude_cmds when excludes is empty 2025-10-19 16:21:27 +02:00
help.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Makefile libsubcmd: Use -O0 with DEBUG=1 2019-11-06 15:49:39 -03:00
pager.c tools lib subcmd: Support overwriting the pager 2018-09-19 15:16:19 -03:00
pager.h tools lib subcmd: Support overwriting the pager 2018-09-19 15:16:19 -03:00
parse-options.c libsubcmd: Fix parse-options memory leak 2024-06-16 13:39:40 +02:00
parse-options.h libsubcmd: add OPT_UINTEGER_OPTARG option type 2021-08-31 15:44:05 -03:00
run-command.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
run-command.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sigchain.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sigchain.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
subcmd-config.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
subcmd-config.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
subcmd-util.h libsubcmd: Fix use-after-free for realloc(..., 0) 2022-02-23 12:03:12 +01:00