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drm/v3d: Fix null pointer dereference of pointer perfmon
[ Upstream commitce7a1ecf3f
] In the unlikely event that pointer perfmon is null the WARN_ON return path occurs after the pointer has already been deferenced. Fix this by only dereferencing perfmon after it has been null checked. Fixes:26a4dc29b7
("drm/v3d: Expose performance counters to userspace") Signed-off-by: Colin Ian King <colin.i.king@gmail.com> Reviewed-by: Juan A. Suarez <jasuarez@igalia.com> Signed-off-by: Melissa Wen <melissa.srw@gmail.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220424183512.1365683-1-colin.i.king@gmail.com Signed-off-by: Sasha Levin <sashal@kernel.org>
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1 changed files with 2 additions and 1 deletions
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@ -25,11 +25,12 @@ void v3d_perfmon_start(struct v3d_dev *v3d, struct v3d_perfmon *perfmon)
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{
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unsigned int i;
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u32 mask;
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u8 ncounters = perfmon->ncounters;
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u8 ncounters;
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if (WARN_ON_ONCE(!perfmon || v3d->active_perfmon))
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return;
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ncounters = perfmon->ncounters;
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mask = GENMASK(ncounters - 1, 0);
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for (i = 0; i < ncounters; i++) {
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