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linux-yocto/net/smc
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Sidraya Jayagond d5411685dc net/smc: fix warning in smc_rx_splice() when calling get_page() 
[ Upstream commit a35c04de2565db191726b5741e6b66a35002c652 ]

smc_lo_register_dmb() allocates DMB buffers with kzalloc(), which are
later passed to get_page() in smc_rx_splice(). Since kmalloc memory is
not page-backed, this triggers WARN_ON_ONCE() in get_page() and prevents
holding a refcount on the buffer. This can lead to use-after-free if
the memory is released before splice_to_pipe() completes.

Use folio_alloc() instead, ensuring DMBs are page-backed and safe for
get_page().

WARNING: CPU: 18 PID: 12152 at ./include/linux/mm.h:1330 smc_rx_splice+0xaf8/0xe20 [smc]
CPU: 18 UID: 0 PID: 12152 Comm: smcapp Kdump: loaded Not tainted 6.17.0-rc3-11705-g9cf4672ecfee #10 NONE
Hardware name: IBM 3931 A01 704 (z/VM 7.4.0)
Krnl PSW : 0704e00180000000 000793161032696c (smc_rx_splice+0xafc/0xe20 [smc])
           R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3
Krnl GPRS: 0000000000000000 001cee80007d3001 00077400000000f8 0000000000000005
           0000000000000001 001cee80007d3006 0007740000001000 001c000000000000
           000000009b0c99e0 0000000000001000 001c0000000000f8 001c000000000000
           000003ffcc6f7c88 0007740003e98000 0007931600000005 000792969b2ff7b8
Krnl Code: 0007931610326960: af000000		mc	0,0
           0007931610326964: a7f4ff43		brc	15,00079316103267ea
          #0007931610326968: af000000		mc	0,0
          >000793161032696c: a7f4ff3f		brc	15,00079316103267ea
           0007931610326970: e320f1000004	lg	%r2,256(%r15)
           0007931610326976: c0e53fd1b5f5	brasl	%r14,000793168fd5d560
           000793161032697c: a7f4fbb5		brc	15,00079316103260e6
           0007931610326980: b904002b		lgr	%r2,%r11
Call Trace:
 smc_rx_splice+0xafc/0xe20 [smc]
 smc_rx_splice+0x756/0xe20 [smc])
 smc_rx_recvmsg+0xa74/0xe00 [smc]
 smc_splice_read+0x1ce/0x3b0 [smc]
 sock_splice_read+0xa2/0xf0
 do_splice_read+0x198/0x240
 splice_file_to_pipe+0x7e/0x110
 do_splice+0x59e/0xde0
 __do_splice+0x11a/0x2d0
 __s390x_sys_splice+0x140/0x1f0
 __do_syscall+0x122/0x280
 system_call+0x6e/0x90
Last Breaking-Event-Address:
smc_rx_splice+0x960/0xe20 [smc]
---[ end trace 0000000000000000 ]---

Fixes: f7a22071db ("net/smc: implement DMB-related operations of loopback-ism")
Reviewed-by: Mahanta Jambigi <mjambigi@linux.ibm.com>
Signed-off-by: Sidraya Jayagond <sidraya@linux.ibm.com>
Link: https://patch.msgid.link/20250917184220.801066-1-sidraya@linux.ibm.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2025-10-02 13:48:30 +02:00
..
af_smc.c net/smc: fix UAF on smcsk after smc_listen_out() 2025-08-28 16:34:48 +02:00
Kconfig net/smc: introduce loopback-ism for SMC intra-OS shortcut 2024-04-30 13:24:48 +02:00
Makefile net/smc: Introduce IPPROTO_SMC 2024-06-17 13:14:09 +01:00
smc_cdc.c net/smc: adapt cursor update when sndbuf and peer DMB are merged 2024-04-30 13:24:48 +02:00
smc_cdc.h
smc_clc.c net/smc: Remove validation of reserved bits in CLC Decline message 2025-09-09 19:02:26 +02:00
smc_clc.h net/smc: check smcd_v2_ext_offset when receiving proposal msg 2024-12-15 12:34:59 +00:00
smc_close.c net/smc: put sk reference if close work was canceled 2023-11-06 10:01:07 +00:00
smc_close.h
smc_core.c net/smc: delete pointless divide by one 2025-01-11 13:08:54 -08:00
smc_core.h net/smc: support SMC-R V2 for rdma devices with max_recv_sge equals to 1 2024-12-12 13:50:00 +01:00
smc_diag.c net: remove sock_i_uid() 2025-09-09 19:02:26 +02:00
smc_ib.c net/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync() 2025-09-09 19:02:23 +02:00
smc_ib.h net/smc: fix smc clc failed issue when netdevice not in init_net 2023-10-13 16:52:02 -07:00
smc_inet.c net/smc: fix lacks of icsk_syn_mss with IPPROTO_SMC 2024-10-10 08:48:11 -07:00
smc_inet.h net/smc: Introduce IPPROTO_SMC 2024-06-17 13:14:09 +01:00
smc_ism.c net/smc: add operations to merge sndbuf with peer DMB 2024-04-30 13:24:48 +02:00
smc_ism.h net/smc: add operations to merge sndbuf with peer DMB 2024-04-30 13:24:48 +02:00
smc_llc.c net/smc: support SMC-R V2 for rdma devices with max_recv_sge equals to 1 2024-12-12 13:50:00 +01:00
smc_llc.h
smc_loopback.c net/smc: fix warning in smc_rx_splice() when calling get_page() 2025-10-02 13:48:30 +02:00
smc_loopback.h net/smc: remove unreferenced header in smc_loopback.h file 2024-07-31 11:48:58 +01:00
smc_netlink.c
smc_netlink.h
smc_netns.h
smc_pnet.c net/smc: use the correct ndev to find pnetid by pnetid table 2025-03-14 12:54:40 +00:00
smc_pnet.h
smc_rx.c net/smc: fix data error when recvmsg with MSG_PEEK flag 2025-01-13 18:59:00 -08:00
smc_rx.h net/smc: fix data error when recvmsg with MSG_PEEK flag 2025-01-13 18:59:00 -08:00
smc_stats.c net/smc: introduce statistics for ringbufs usage of net namespace 2024-08-20 11:38:23 +02:00
smc_stats.h net/smc: introduce statistics for ringbufs usage of net namespace 2024-08-20 11:38:23 +02:00
smc_sysctl.c net/smc: add sysctl for smc_limit_hs 2024-09-10 12:11:04 +02:00
smc_sysctl.h net/smc: add sysctl for max conns per lgr for SMC-R v2.1 2023-11-24 12:13:14 +00:00
smc_tracepoint.c
smc_tracepoint.h tracing/treewide: Remove second parameter of __assign_str() 2024-05-22 20:14:47 -04:00
smc_tx.c net/smc: remove unneeded atomic operations in smc_tx_sndbuf_nonempty 2023-11-24 15:00:47 +00:00
smc_tx.h
smc_wr.c net/smc: support SMC-R V2 for rdma devices with max_recv_sge equals to 1 2024-12-12 13:50:00 +01:00
smc_wr.h
smc.h smc: Fix various oops due to inet_sock type confusion. 2025-07-14 17:12:42 -07:00