From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Vasily Averin <vvs@virtuozzo.com>,
Daniel Borkmann <daniel@iogearbox.net>,
Sasha Levin <sashal@kernel.org>,
netdev@vger.kernel.org, bpf@vger.kernel.org
Subject: [PATCH AUTOSEL 4.19 226/252] bpf: map_seq_next should always increase position index
Date: Fri, 14 Feb 2020 11:11:21 -0500 [thread overview]
Message-ID: <20200214161147.15842-226-sashal@kernel.org> (raw)
In-Reply-To: <20200214161147.15842-1-sashal@kernel.org>
From: Vasily Averin <vvs@virtuozzo.com>
[ Upstream commit 90435a7891a2259b0f74c5a1bc5600d0d64cba8f ]
If seq_file .next fuction does not change position index,
read after some lseek can generate an unexpected output.
See also: https://bugzilla.kernel.org/show_bug.cgi?id=206283
v1 -> v2: removed missed increment in end of function
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/eca84fdd-c374-a154-d874-6c7b55fc3bc4@virtuozzo.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
kernel/bpf/inode.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/kernel/bpf/inode.c b/kernel/bpf/inode.c
index dc9d7ac8228db..c04815bb15cc1 100644
--- a/kernel/bpf/inode.c
+++ b/kernel/bpf/inode.c
@@ -198,6 +198,7 @@ static void *map_seq_next(struct seq_file *m, void *v, loff_t *pos)
void *key = map_iter(m)->key;
void *prev_key;
+ (*pos)++;
if (map_iter(m)->done)
return NULL;
@@ -210,8 +211,6 @@ static void *map_seq_next(struct seq_file *m, void *v, loff_t *pos)
map_iter(m)->done = true;
return NULL;
}
-
- ++(*pos);
return key;
}
--
2.20.1
next prev parent reply other threads:[~2020-02-14 17:00 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200214161147.15842-1-sashal@kernel.org>
2020-02-14 16:07 ` [PATCH AUTOSEL 4.19 008/252] brcmfmac: Fix use after free in brcmf_sdio_readframes() Sasha Levin
2020-02-14 16:07 ` [PATCH AUTOSEL 4.19 012/252] gianfar: Fix TX timestamping with a stacked DSA driver Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 046/252] ath10k: Correct the DMA direction for management tx buffers Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 047/252] libertas: don't exit from lbs_ibss_join_existing() with RCU read lock held Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 048/252] libertas: make lbs_ibss_join_existing() return error code on rates overflow Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 077/252] net/wan/fsl_ucc_hdlc: reject muram offsets above 64K Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 079/252] NFC: port100: Convert cpu_to_le16(le16_to_cpu(E1) + E2) to use le16_add_cpu() Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 097/252] r8169: check that Realtek PHY driver module is loaded Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 098/252] fore200e: Fix incorrect checks of NULL pointer dereference Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 099/252] isdn: don't mark kcapi_proc_exit as __exit Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 100/252] netfilter: nft_tunnel: add the missing ERSPAN_VERSION nla_policy Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 103/252] b43legacy: Fix -Wcast-function-type Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 104/252] ipw2x00: " Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 105/252] iwlegacy: " Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 106/252] rtlwifi: rtl_pci: " Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 108/252] orinoco: avoid assertion in case of NULL pointer Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 120/252] net/wan/fsl_ucc_hdlc: remove set but not used variables 'ut_info' and 'ret' Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 131/252] tools lib api fs: Fix gcc9 stringop-truncation compilation error Sasha Levin
2020-02-14 16:09 ` [PATCH AUTOSEL 4.19 134/252] mlx5: work around high stack usage with gcc Sasha Levin
2020-02-14 16:10 ` [PATCH AUTOSEL 4.19 154/252] wan: ixp4xx_hss: fix compile-testing on 64-bit Sasha Levin
2020-02-14 16:10 ` [PATCH AUTOSEL 4.19 166/252] bpf: Return -EBADRQC for invalid map type in __bpf_tx_xdp_map Sasha Levin
2020-02-14 16:11 ` [PATCH AUTOSEL 4.19 215/252] selftests: bpf: Reset global state between reuseport test runs Sasha Levin
2020-02-14 16:11 ` [PATCH AUTOSEL 4.19 219/252] ath10k: pci: Only dump ATH10K_MEM_REGION_TYPE_IOREG when safe Sasha Levin
2020-02-14 16:11 ` [PATCH AUTOSEL 4.19 220/252] hostap: Adjust indentation in prism2_hostapd_add_sta Sasha Levin
2020-02-14 16:11 ` [PATCH AUTOSEL 4.19 221/252] rtlwifi: rtl8821ae: remove unused variables Sasha Levin
2020-02-14 16:11 ` [PATCH AUTOSEL 4.19 222/252] rtlwifi: rtl8192ee: " Sasha Levin
2020-02-14 16:11 ` [PATCH AUTOSEL 4.19 223/252] rtlwifi: rtl8723ae: " Sasha Levin
2020-02-14 16:11 ` [PATCH AUTOSEL 4.19 224/252] iwlegacy: ensure loop counter addr does not wrap and cause an infinite loop Sasha Levin
2020-02-14 16:11 ` Sasha Levin [this message]
2020-02-14 16:11 ` [PATCH AUTOSEL 4.19 227/252] mwifiex: Fix possible buffer overflows in mwifiex_ret_wmm_get_status() Sasha Levin
2020-02-14 16:11 ` [PATCH AUTOSEL 4.19 228/252] mwifiex: Fix possible buffer overflows in mwifiex_cmd_append_vsie_tlv() Sasha Levin
2020-02-14 16:11 ` [PATCH AUTOSEL 4.19 242/252] iwlwifi: mvm: Fix thermal zone registration Sasha Levin
2020-02-14 16:11 ` [PATCH AUTOSEL 4.19 252/252] mlxsw: spectrum_dpipe: Add missing error path Sasha Levin
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