linux-kernel - Re: [PATCH] net/rds: Fix UBSAN: array-index-out-of-bounds in rds_cmsg

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Date: Mon, 22 Jan 2024 11:30:24 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Sharath Srinivasan <sharath.srinivasan@...cle.com>
Cc: santosh.shilimkar@...cle.com, netdev@...r.kernel.org,
 linux-rdma@...r.kernel.org, rds-devel@....oracle.com,
 linux-kernel@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, syzkaller@...glegroups.com,
 chenyuan0y@...il.com, zzjas98@...il.com, gerd.rausch@...cle.com,
 allison.henderson@...cle.com, aron.silverton@...cle.com
Subject: Re: [PATCH] net/rds: Fix UBSAN: array-index-out-of-bounds in
 rds_cmsg_recv

Hello:

This patch was applied to netdev/net.git (main)
by David S. Miller <davem@...emloft.net>:

On Fri, 19 Jan 2024 17:48:39 -0800 you wrote:
> Syzcaller UBSAN crash occurs in rds_cmsg_recv(),
> which reads inc->i_rx_lat_trace[j + 1] with index 4 (3 + 1),
> but with array size of 4 (RDS_RX_MAX_TRACES).
> Here 'j' is assigned from rs->rs_rx_trace[i] and in-turn from
> trace.rx_trace_pos[i] in rds_recv_track_latency(),
> with both arrays sized 3 (RDS_MSG_RX_DGRAM_TRACE_MAX). So fix the
> off-by-one bounds check in rds_recv_track_latency() to prevent
> a potential crash in rds_cmsg_recv().
> 
> [...]

Here is the summary with links:
  - net/rds: Fix UBSAN: array-index-out-of-bounds in rds_cmsg_recv
    https://git.kernel.org/netdev/net/c/13e788deb734

You are awesome, thank you!
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