| Message ID | 20220815145740.12075-2-olek2@wp.pl (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | net: lantiq_xrx200: fix errors under memory pressure | expand |
| Context | Check | Description |
|---|---|---|
| netdev/tree_selection | success | Clearly marked for net |
| netdev/fixes_present | success | Fixes tag present in non-next series |
| netdev/subject_prefix | success | Link |
| netdev/cover_letter | success | Series has a cover letter |
| netdev/patch_count | success | Link |
| netdev/header_inline | success | No static functions without inline keyword in header files |
| netdev/build_32bit | success | Errors and warnings before: 0 this patch: 0 |
| netdev/cc_maintainers | success | CCed 7 of 7 maintainers |
| netdev/build_clang | success | Errors and warnings before: 0 this patch: 0 |
| netdev/module_param | success | Was 0 now: 0 |
| netdev/verify_signedoff | success | Signed-off-by tag matches author and committer |
| netdev/check_selftest | success | No net selftest shell script |
| netdev/verify_fixes | success | Fixes tag looks correct |
| netdev/build_allmodconfig_warn | success | Errors and warnings before: 0 this patch: 0 |
| netdev/checkpatch | success | total: 0 errors, 0 warnings, 0 checks, 13 lines checked |
| netdev/kdoc | success | Errors and warnings before: 0 this patch: 0 |
| netdev/source_inline | success | Was 0 now: 0 |
On Mon, 15 Aug 2022 16:57:38 +0200 Aleksander Jan Bajkowski wrote:
> + netdev_err(net_dev, "failed to build skb\n");
I don't thinkg this is needed, is build_skb() using GFP_NOWARN?
Otherwise there will be an OOM splat anyway. Do check, I'm not sure.
If there won't be an OOM splat this line should be rate limited.
diff --git a/drivers/net/ethernet/lantiq_xrx200.c b/drivers/net/ethernet/lantiq_xrx200.c index 5edb68a8aab1..6a83a6c19484 100644 --- a/drivers/net/ethernet/lantiq_xrx200.c +++ b/drivers/net/ethernet/lantiq_xrx200.c @@ -239,6 +239,13 @@ static int xrx200_hw_receive(struct xrx200_chan *ch) } skb = build_skb(buf, priv->rx_skb_size); + if (!skb) { + skb_free_frag(buf); + net_dev->stats.rx_dropped++; + netdev_err(net_dev, "failed to build skb\n"); + return -ENOMEM; + } + skb_reserve(skb, NET_SKB_PAD); skb_put(skb, len);
xrx200_hw_receive() assumes build_skb() always works and goes straight to skb_reserve(). However, build_skb() can fail under memory pressure. Add a check in case build_skb() failed to allocate and return NULL. Fixes: e015593573b3 ("net: lantiq_xrx200: convert to build_skb") Reported-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl> --- drivers/net/ethernet/lantiq_xrx200.c | 7 +++++++ 1 file changed, 7 insertions(+)