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-rw-r--r--kernel/trace/trace_probe.c50
1 files changed, 31 insertions, 19 deletions
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 8c0553d9afd3..52478f033f88 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -21,6 +21,7 @@
* Copyright (C) IBM Corporation, 2010-2011
* Author: Srikar Dronamraju
*/
+#define pr_fmt(fmt) "trace_probe: " fmt
#include "trace_probe.h"
@@ -647,7 +648,7 @@ ssize_t traceprobe_probes_write(struct file *file, const char __user *buffer,
size_t count, loff_t *ppos,
int (*createfn)(int, char **))
{
- char *kbuf, *tmp;
+ char *kbuf, *buf, *tmp;
int ret = 0;
size_t done = 0;
size_t size;
@@ -667,27 +668,38 @@ ssize_t traceprobe_probes_write(struct file *file, const char __user *buffer,
goto out;
}
kbuf[size] = '\0';
- tmp = strchr(kbuf, '\n');
+ buf = kbuf;
+ do {
+ tmp = strchr(buf, '\n');
+ if (tmp) {
+ *tmp = '\0';
+ size = tmp - buf + 1;
+ } else {
+ size = strlen(buf);
+ if (done + size < count) {
+ if (buf != kbuf)
+ break;
+ /* This can accept WRITE_BUFSIZE - 2 ('\n' + '\0') */
+ pr_warn("Line length is too long: Should be less than %d\n",
+ WRITE_BUFSIZE - 2);
+ ret = -EINVAL;
+ goto out;
+ }
+ }
+ done += size;
- if (tmp) {
- *tmp = '\0';
- size = tmp - kbuf + 1;
- } else if (done + size < count) {
- pr_warn("Line length is too long: Should be less than %d\n",
- WRITE_BUFSIZE);
- ret = -EINVAL;
- goto out;
- }
- done += size;
- /* Remove comments */
- tmp = strchr(kbuf, '#');
+ /* Remove comments */
+ tmp = strchr(buf, '#');
- if (tmp)
- *tmp = '\0';
+ if (tmp)
+ *tmp = '\0';
- ret = traceprobe_command(kbuf, createfn);
- if (ret)
- goto out;
+ ret = traceprobe_command(buf, createfn);
+ if (ret)
+ goto out;
+ buf += size;
+
+ } while (done < count);
}
ret = done;
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