diff options
Diffstat (limited to 'kernel/trace/trace.c')
-rw-r--r-- | kernel/trace/trace.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 32c069bbf41b..56608538a4ad 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; @@ -1236,18 +1234,18 @@ int trace_get_user(struct trace_parser *parser, const char __user *ubuf, cnt--; } + parser->idx = 0; + /* only spaces were written */ - if (isspace(ch)) { + if (isspace(ch) || !ch) { *ppos += read; ret = read; goto out; } - - parser->idx = 0; } /* read the non-space input */ - while (cnt && !isspace(ch)) { + while (cnt && !isspace(ch) && ch) { if (parser->idx < parser->size - 1) parser->buffer[parser->idx++] = ch; else { @@ -1262,12 +1260,14 @@ int trace_get_user(struct trace_parser *parser, const char __user *ubuf, } /* We either got finished input or we have to wait for another call. */ - if (isspace(ch)) { + if (isspace(ch) || !ch) { parser->buffer[parser->idx] = 0; parser->cont = false; } 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; |