6.12-stable review patch. If anyone has any objections, please let me know.
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From: Pengtao He hept.hept.hept@gmail.com
[ Upstream commit 491deb9b8c4ad12fe51d554a69b8165b9ef9429f ]
We cannot set frag_list to NULL pointer when alloc_page failed. It will be used in tls_strp_check_queue_ok when the next time tls_strp_read_sock is called.
This is because we don't reset full_len in tls_strp_flush_anchor_copy() so the recv path will try to continue handling the partial record on the next call but we dettached the rcvq from the frag list. Alternative fix would be to reset full_len.
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000028 Call trace: tls_strp_check_rcv+0x128/0x27c tls_strp_data_ready+0x34/0x44 tls_data_ready+0x3c/0x1f0 tcp_data_ready+0x9c/0xe4 tcp_data_queue+0xf6c/0x12d0 tcp_rcv_established+0x52c/0x798
Fixes: 84c61fe1a75b ("tls: rx: do not use the standard strparser") Signed-off-by: Pengtao He hept.hept.hept@gmail.com Link: https://patch.msgid.link/20250514132013.17274-1-hept.hept.hept@gmail.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/tls/tls_strp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/tls/tls_strp.c b/net/tls/tls_strp.c index 77e33e1e340e3..65b0da6fdf6a7 100644 --- a/net/tls/tls_strp.c +++ b/net/tls/tls_strp.c @@ -396,7 +396,6 @@ static int tls_strp_read_copy(struct tls_strparser *strp, bool qshort) return 0;
shinfo = skb_shinfo(strp->anchor); - shinfo->frag_list = NULL;
/* If we don't know the length go max plus page for cipher overhead */ need_spc = strp->stm.full_len ?: TLS_MAX_PAYLOAD_SIZE + PAGE_SIZE; @@ -412,6 +411,8 @@ static int tls_strp_read_copy(struct tls_strparser *strp, bool qshort) page, 0, 0); }
+ shinfo->frag_list = NULL; + strp->copy_mode = 1; strp->stm.offset = 0;