diff options
| author | Jiri Slaby <jslaby@suse.cz> | 2012-08-07 21:47:39 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-10-07 08:39:31 -0700 |
| commit | 10b96fa9ff7a3607bb39548025cbad3009f7d587 (patch) | |
| tree | 6304a74501aaebab94bc0f4239c7b295299e9414 | |
| parent | 79abf5039669ff6761d785d78b0c1767811b70ae (diff) | |
TTY: ttyprintk, don't touch behind tty->write_buf
commit ee8b593affdf893012e57f4c54a21984d1b0d92e upstream.
If a user provides a buffer larger than a tty->write_buf chunk and
passes '\r' at the end of the buffer, we touch an out-of-bound memory.
Add a check there to prevent this.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Samo Pogacnik <samo_pogacnik@t-2.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/char/ttyprintk.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/char/ttyprintk.c b/drivers/char/ttyprintk.c index 46b77ede84c0..a7c6d6a07d3c 100644 --- a/drivers/char/ttyprintk.c +++ b/drivers/char/ttyprintk.c @@ -67,7 +67,7 @@ static int tpk_printk(const unsigned char *buf, int count) tmp[tpk_curr + 1] = '\0'; printk(KERN_INFO "%s%s", tpk_tag, tmp); tpk_curr = 0; - if (buf[i + 1] == '\n') + if ((i + 1) < count && buf[i + 1] == '\n') i++; break; case '\n': |