When ss is invoked with the no-header flag, if the query doesn't return
any result, render() is called with 'buffer' uninitialized. This
currently leads to a segfault. Ensure that buffer is initialized before
rendering.
The bug can be triggered with: ss -H sport = 100000
Signed-off-by: Jean-Philippe Brucker <jphilippe.bruc...@gmail.com>
---
misc/ss.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/misc/ss.c b/misc/ss.c
index e047f9c0..e087bef7 100644
--- a/misc/ss.c
+++ b/misc/ss.c
@@ -1197,10 +1197,15 @@ newline:
/* Render buffered output with spacing and delimiters, then free up buffers */
static void render(int screen_width)
{
- struct buf_token *token = (struct buf_token *)buffer.head->data;
+ struct buf_token *token;
int printed, line_started = 0;
struct column *f;
+ if (!buffer.head)
+ return;
+
+ token = (struct buf_token *)buffer.head->data;
+
/* Ensure end alignment of last token, it wasn't necessarily flushed */
buffer.tail->end += buffer.cur->len % 2;
--
2.16.2
