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authorJerry Snitselaar <jsnitsel@redhat.com>2015-11-16 12:57:28 -0700
committerSteven Rostedt <rostedt@goodmis.org>2015-12-23 14:27:20 -0500
commitff078d8fc644722f7b163d79e8a03b00b9dc2385 (patch)
tree54ed114e88d8d85899d3e9821d6ff4523b726291
parent27dff4e04199cf0ecf06239a26d0d225d3c046e9 (diff)
downloadlinux-ff078d8fc644722f7b163d79e8a03b00b9dc2385.tar.gz
tracing: Use seq_buf_used() in seq_buf_to_user() instead of len
commit 5ac48378414d ("tracing: Use trace_seq_used() and seq_buf_used() instead of len") changed the tracing code to use trace_seq_used() and seq_buf_used() instead of using the seq_buf len directly to avoid overflow issues, but missed a spot in seq_buf_to_user() that makes use of s->len. Cleaned up the code a bit as well per suggestion of Steve Rostedt. Link: http://lkml.kernel.org/r/1447703848-2951-1-git-send-email-jsnitsel@redhat.com Signed-off-by: Jerry Snitselaar <jsnitsel@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-rw-r--r--lib/seq_buf.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/lib/seq_buf.c b/lib/seq_buf.c
index 5c94e1012a91..cb18469e1f49 100644
--- a/lib/seq_buf.c
+++ b/lib/seq_buf.c
@@ -306,10 +306,12 @@ int seq_buf_to_user(struct seq_buf *s, char __user *ubuf, int cnt)
if (!cnt)
return 0;
- if (s->len <= s->readpos)
+ len = seq_buf_used(s);
+
+ if (len <= s->readpos)
return -EBUSY;
- len = seq_buf_used(s) - s->readpos;
+ len -= s->readpos;
if (cnt > len)
cnt = len;
ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt);