This patch fixes a memory leak bug reported by syzbot. Link to the bug is given at [1].
A local variable name is used to hold the copied user buffer string using strndup_user. strndup_user allocates memory using kmalloc_track_caller in memdup_user. This kmalloc allocation needs to be followed by a kfree. This patch has been tested by a compile test. [1] https://syzkaller.appspot.com/bug?id=ce692a3aa13e00e335e090be7846c6eb60ddff7a Reported-by: syzbot+b2098bc44728a4efb...@syzkaller.appspotmail.com Signed-off-by: Bharath Vedartham <linux.b...@gmail.com> --- drivers/dma-buf/dma-buf.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index f45bfb2..9798f6d 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -342,6 +342,7 @@ static long dma_buf_set_name(struct dma_buf *dmabuf, const char __user *buf) } kfree(dmabuf->name); dmabuf->name = name; + kfree(name); out_unlock: mutex_unlock(&dmabuf->lock); -- 2.7.4
