diff mbox

[3.13,057/103] ALSA: core: fix buffer overflow in snd_info_get_line()

Message ID 1412112708-27356-58-git-send-email-kamal@canonical.com
State New
Headers show

Commit Message

Kamal Mostafa Sept. 30, 2014, 9:31 p.m. UTC 
3.13.11.8 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Clemens Ladisch <clemens@ladisch.de>

commit ddc64b278a4dda052390b3de1b551e59acdff105 upstream.

snd_info_get_line() documents that its last parameter must be one
less than the buffer size, but this API design guarantees that
(literally) every caller gets it wrong.

Just change this parameter to have its obvious meaning.

Reported-by: Tommi Rantala <tt.rantala@gmail.com>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 sound/core/info.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox

Patch

diff --git a/sound/core/info.c b/sound/core/info.c
index e79baa1..08070e1 100644
--- a/sound/core/info.c
+++ b/sound/core/info.c
@@ -679,7 +679,7 @@  int snd_info_card_free(struct snd_card *card)
  * snd_info_get_line - read one line from the procfs buffer
  * @buffer: the procfs buffer
  * @line: the buffer to store
- * @len: the max. buffer size - 1
+ * @len: the max. buffer size
  *
  * Reads one line from the buffer and stores the string.
  *
@@ -699,7 +699,7 @@  int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len)
 			buffer->stop = 1;
 		if (c == '\n')
 			break;
-		if (len) {
+		if (len > 1) {
 			len--;
 			*line++ = c;
 		}