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trace_events_hist: add check for return value of 'create_hist_field'

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commit 8b152e9150 upstream.

Function 'create_hist_field' is called recursively at
trace_events_hist.c:1954 and can return NULL-value that's why we have
to check it to avoid null pointer dereference.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Link: https://lkml.kernel.org/r/20230111120409.4111-1-n.petrova@fintech.ru

Cc: stable@vger.kernel.org
Fixes: 30350d65ac ("tracing: Add variable support to hist triggers")
Signed-off-by: Natalia Petrova <n.petrova@fintech.ru>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Natalia Petrova 2023-01-11 15:04:09 +03:00 committed by Greg Kroah-Hartman
parent de3930a488
commit 886aa44923
1 changed files with 2 additions and 0 deletions
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2
kernel/trace/trace_events_hist.c
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@ -1646,6 +1646,8 @@ static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
unsigned long fl = flags & ~HIST_FIELD_FL_LOG2;
hist_field->fn = hist_field_log2;
hist_field->operands[0] = create_hist_field(hist_data, field, fl, NULL);
if (!hist_field->operands[0])
goto free;
hist_field->size = hist_field->operands[0]->size;
hist_field->type = kstrdup(hist_field->operands[0]->type, GFP_KERNEL);
if (!hist_field->type)