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| author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2021-04-01 14:58:23 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-01-09 13:25:04 +0100 |
| commit | 1bf53a2145fa416e3c6825c7d3c267f4b7e32e24 (patch) | |
| tree | e5847db91a753b551dbe9f95db8f094a1e66ae72 /scripts/gcc-plugins/sancov_plugin.c | |
| parent | ba5120a2fb5f23b4d39d302e181aa5d4e28a90d1 (diff) | |
kernel: Initialize cpumask before parsing
[ Upstream commit c5e3a41187ac01425f5ad1abce927905e4ac44e4 ]
KMSAN complains that new_value at cpumask_parse_user() from
write_irq_affinity() from irq_affinity_proc_write() is uninitialized.
[ 148.133411][ T5509] =====================================================
[ 148.135383][ T5509] BUG: KMSAN: uninit-value in find_next_bit+0x325/0x340
[ 148.137819][ T5509]
[ 148.138448][ T5509] Local variable ----new_value.i@irq_affinity_proc_write created at:
[ 148.140768][ T5509] irq_affinity_proc_write+0xc3/0x3d0
[ 148.142298][ T5509] irq_affinity_proc_write+0xc3/0x3d0
[ 148.143823][ T5509] =====================================================
Since bitmap_parse() from cpumask_parse_user() calls find_next_bit(),
any alloc_cpumask_var() + cpumask_parse_user() sequence has possibility
that find_next_bit() accesses uninitialized cpu mask variable. Fix this
problem by replacing alloc_cpumask_var() with zalloc_cpumask_var().
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Link: https://lore.kernel.org/r/20210401055823.3929-1-penguin-kernel@I-love.SAKURA.ne.jp
Stable-dep-of: 98feccbf32cf ("tracing: Prevent bad count for tracing_cpumask_write")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'scripts/gcc-plugins/sancov_plugin.c')
0 files changed, 0 insertions, 0 deletions