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net: fix pointer check in skb_pp_cow_data routine

Properly check page pointer returned by page_pool_dev_alloc routine in
skb_pp_cow_data() for non-linear part of the original skb.

Reported-by: Julian Wiedmann <jwiedmann.dev@gmail.com>
Closes: https://lore.kernel.org/netdev/cover.1707729884.git.lorenzo@kernel.org/T/#m7d189b0015a7281ed9221903902490c03ed19a7a
Fixes: e6d5dbdd20aa ("xdp: add multi-buff support for xdp running in generic mode")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Link: https://lore.kernel.org/r/25512af3e09befa9dcb2cf3632bdc45b807cf330.1708167716.git.lorenzo@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

authored by

Lorenzo Bianconi and committed by
Jakub Kicinski c6a28acb 49344462

+1 -1
+1 -1
net/core/skbuff.c
··· 968 968 truesize = size; 969 969 970 970 page = page_pool_dev_alloc(pool, &page_off, &truesize); 971 - if (!data) { 971 + if (!page) { 972 972 consume_skb(nskb); 973 973 return -ENOMEM; 974 974 }