Re: [PATCH v3 03/11] media: videobuf2: Remove VB2_MAX_FRAME limit on buffer storage

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Le 22/06/2023 à 16:11, Dan Carpenter a écrit :
On Thu, Jun 22, 2023 at 03:13:41PM +0200, Benjamin Gaignard wrote:
diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index f1ff7af34a9f..86e1e926fa45 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -455,9 +455,9 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory,
  	struct vb2_buffer *vb;
  	int ret;
- /* Ensure that q->num_buffers+num_buffers is below VB2_MAX_FRAME */
+	/* Ensure that q->num_buffers + num_buffers is UINT_MAX */
  	num_buffers = min_t(unsigned int, num_buffers,
-			    VB2_MAX_FRAME - q->num_buffers);
+			    UINT_MAX - q->num_buffers);
for (buffer = 0; buffer < num_buffers; ++buffer) {
  		/* Allocate vb2 buffer structures */
Ah...  Here's one of the integer overflow bugs I was talking about.  The
__vb2_queue_alloc() function returns an int so if num_buffers goes over
INT_MAX we are hosed.

I will limit it to:
#define VB2_QUEUE_MAX_BUFFERS  (INT_MAX & PAGE_MASK)  /* The mask prevents 85% of integer overflows */
as you have suggest it.

That will be in version 4.

Thanks,
Benjamin


regards,
dan carpenter





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