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netmem: fix skb_frag_address_safe with unreadable skbs

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[ Upstream commit 4672aec56d ]

skb_frag_address_safe() needs a check that the
skb_frag_page exists check similar to skb_frag_address().

Cc: ap420073@gmail.com

Signed-off-by: Mina Almasry <almasrymina@google.com>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20250619175239.3039329-1-almasrymina@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mina Almasry 2025-06-19 17:52:38 +00:00 committed by Greg Kroah-Hartman
parent c040dafe19
commit cbdc9ea044
1 changed files with 7 additions and 1 deletions
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8
include/linux/skbuff.h
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@ -3688,7 +3688,13 @@ static inline void *skb_frag_address(const skb_frag_t *frag)
*/
static inline void *skb_frag_address_safe(const skb_frag_t *frag)
{
void *ptr = page_address(skb_frag_page(frag));
struct page *page = skb_frag_page(frag);
void *ptr;
if (!page)
return NULL;
ptr = page_address(page);
if (unlikely(!ptr))
return NULL;