On Mon, Sep 07, 2015 at 10:53:06AM +0100, Emil Velikov wrote:
> As going through the modetest patches for atomic support I've noticed
> that if we pass NULL for the drmModeAtomicReqPtr argument we'll crash.
>
> So let's handle things appropriately if the user forgot to check the
> return value of drmModeAtomicAlloc and drmModeAtomicDuplicate or made a
> typo somewhere along the way.
I'm not sure hand-holding the user to such an extent is actually useful.
OTOH I guess one NULL check per function call isn't all that expensive
either.
>
> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Cc: Rob Clark <robclark@xxxxxxxxxxxxxxx>
> Cc: Daniel Stone <daniels@xxxxxxxxxxxxx>
> Signed-off-by: Emil Velikov <emil.l.velikov@xxxxxxxxx>
> ---
> xf86drmMode.c | 17 ++++++++++++++++-
> 1 file changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/xf86drmMode.c b/xf86drmMode.c
> index 23800dd..ab6b519 100644
> --- a/xf86drmMode.c
> +++ b/xf86drmMode.c
> @@ -1189,6 +1189,9 @@ drmModeAtomicReqPtr drmModeAtomicDuplicate(drmModeAtomicReqPtr old)
> {
> drmModeAtomicReqPtr new;
>
> + if (!old)
> + return NULL;
> +
> new = drmMalloc(sizeof *new);
> if (!new)
> return NULL;
> @@ -1213,6 +1216,9 @@ drmModeAtomicReqPtr drmModeAtomicDuplicate(drmModeAtomicReqPtr old)
>
> int drmModeAtomicMerge(drmModeAtomicReqPtr base, drmModeAtomicReqPtr augment)
> {
> + if (!base)
> + return -EINVAL;
> +
> if (!augment || augment->cursor == 0)
> return 0;
>
> @@ -1239,12 +1245,15 @@ int drmModeAtomicMerge(drmModeAtomicReqPtr base, drmModeAtomicReqPtr augment)
>
> int drmModeAtomicGetCursor(drmModeAtomicReqPtr req)
> {
> + if (!req)
> + return -EINVAL;
> return req->cursor;
> }
>
> void drmModeAtomicSetCursor(drmModeAtomicReqPtr req, int cursor)
> {
> - req->cursor = cursor;
> + if (req)
> + req->cursor = cursor;
> }
>
> int drmModeAtomicAddProperty(drmModeAtomicReqPtr req,
> @@ -1252,6 +1261,9 @@ int drmModeAtomicAddProperty(drmModeAtomicReqPtr req,
> uint32_t property_id,
> uint64_t value)
> {
> + if (!req)
> + return -EINVAL;
> +
> if (req->cursor >= req->size_items) {
> drmModeAtomicReqItemPtr new;
>
> @@ -1309,6 +1321,9 @@ int drmModeAtomicCommit(int fd, drmModeAtomicReqPtr req, uint32_t flags,
> int obj_idx = -1;
> int ret = -1;
>
> + if (!req)
> + return -EINVAL;
> +
> if (req->cursor == 0)
> return 0;
>
> --
> 2.5.0
--
Ville Syrjälä
Intel OTC
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