The callback function dma_buf_describe() returns an int not void so the function pointer cast in dma_buf_show() is wrong. dma_buf_describe() can also fail when acquiring the mutex gets interrupted so always returning 0 in dma_buf_show() is wrong, too.
Fix both issues by casting the function pointer to the correct type and propagate its return value.
This type mismatch was caught by the PaX RAP plugin.
Signed-off-by: Mathias Krause minipli@googlemail.com Cc: Sumit Semwal sumit.semwal@linaro.org Cc: Daniel Vetter daniel.vetter@ffwll.ch Cc: PaX Team pageexec@freemail.hu --- drivers/dma-buf/dma-buf.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index 6355ab38d630..0f2a4592fdd2 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -881,10 +881,9 @@ static int dma_buf_describe(struct seq_file *s)
static int dma_buf_show(struct seq_file *s, void *unused) { - void (*func)(struct seq_file *) = s->private; + int (*func)(struct seq_file *) = s->private;
- func(s); - return 0; + return func(s); }
static int dma_buf_debug_open(struct inode *inode, struct file *file)