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tracing/filters: fix off-by-one bug

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We should leave the last slot for the ending '\0'.

[ Impact: fix possible crash when the length of an operand is 128 ]

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <4A0CDC8C.30602@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Li Zefan 2009-05-15 11:07:56 +08:00 committed by Steven Rostedt
parent 8cd995b6de
commit 5872144f64
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/trace_events_filter.c
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@ -736,7 +736,7 @@ static inline void clear_operand_string(struct filter_parse_state *ps)
static inline int append_operand_char(struct filter_parse_state *ps, char c)
{
if (ps->operand.tail == MAX_FILTER_STR_VAL)
if (ps->operand.tail == MAX_FILTER_STR_VAL - 1)
return -EINVAL;
ps->operand.string[ps->operand.tail++] = c;