From: Changbin Du Always mark the parsed string with a terminated nul '\0' character. This removes the need for the users to have to append the '\0' before using the parsed string. Link: http://lkml.kernel.org/r/1516093350-12045-4-git-send-email-changbin.du@intel.com Acked-by: Namhyung Kim Signed-off-by: Changbin Du Signed-off-by: Steven Rostedt (VMware) --- kernel/trace/ftrace.c | 2 -- kernel/trace/trace.c | 4 ++-- kernel/trace/trace_events.c | 2 -- 3 files changed, 2 insertions(+), 6 deletions(-) diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 554b517c61a0..dabd9d167d42 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -5015,7 +5015,6 @@ int ftrace_regex_release(struct inode *inode, struct file *file) parser = &iter->parser; if (trace_parser_loaded(parser)) { - parser->buffer[parser->idx] = 0; ftrace_match_records(iter->hash, parser->buffer, parser->idx); } @@ -5329,7 +5328,6 @@ ftrace_graph_release(struct inode *inode, struct file *file) parser = &fgd->parser; if (trace_parser_loaded((parser))) { - parser->buffer[parser->idx] = 0; ret = ftrace_graph_set_hash(fgd->new_hash, parser->buffer); } diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index cb90435e63da..58de825df19c 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -530,8 +530,6 @@ int trace_pid_write(struct trace_pid_list *filtered_pids, ubuf += ret; cnt -= ret; - parser.buffer[parser.idx] = 0; - ret = -EINVAL; if (kstrtoul(parser.buffer, 0, &val)) break; @@ -1268,6 +1266,8 @@ int trace_get_user(struct trace_parser *parser, const char __user *ubuf, } else if (parser->idx < parser->size - 1) { parser->cont = true; parser->buffer[parser->idx++] = ch; + /* Make sure the parsed string always terminates with '\0'. */ + parser->buffer[parser->idx] = 0; } else { ret = -EINVAL; goto out; diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c index 1b87157edbff..05c7172c6667 100644 --- a/kernel/trace/trace_events.c +++ b/kernel/trace/trace_events.c @@ -885,8 +885,6 @@ ftrace_event_write(struct file *file, const char __user *ubuf, if (*parser.buffer == '!') set = 0; - parser.buffer[parser.idx] = 0; - ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); if (ret) goto out_put; -- 2.15.1