linux-kernel - Re: [PATCH] coresight: tmc: sg: Do not leak sg

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Message-Id: <172416269493.339483.9402392984207620369.b4-ty@arm.com>
Date: Tue, 20 Aug 2024 15:05:08 +0100
From: Suzuki K Poulose <suzuki.poulose@....com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
	coresight@...ts.linaro.org
Cc: James Clark <james.clark@....com>,
	linux-kernel@...r.kernel.org,
	anshuman.khandual@....com,
	mike.leach@...aro.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] coresight: tmc: sg: Do not leak sg_table

On Tue, 2 Jul 2024 14:28:46 +0100, Suzuki K Poulose wrote:
> Running perf with cs_etm on Juno triggers the following kmemleak warning !
> 
> :~# cat /sys/kernel/debug/kmemleak
>  unreferenced object 0xffffff8806b6d720 (size 96):
>  comm "perf", pid 562, jiffies 4297810960
>  hex dump (first 32 bytes):
>  38 d8 13 07 88 ff ff ff 00 d0 9e 85 c0 ff ff ff  8...............
>  00 10 00 88 c0 ff ff ff 00 f0 ff f7 ff 00 00 00  ................
>  backtrace (crc 1dbf6e00):
>  [<ffffffc08107381c>] kmemleak_alloc+0xbc/0xd8
>  [<ffffffc0802f9798>] kmalloc_trace_noprof+0x220/0x2e8
>  [<ffffffc07bb71948>] tmc_alloc_sg_table+0x48/0x208 [coresight_tmc]
>  [<ffffffc07bb71cbc>] tmc_etr_alloc_sg_buf+0xac/0x240 [coresight_tmc]
>  [<ffffffc07bb72538>] tmc_alloc_etr_buf.constprop.0+0x1f0/0x260 [coresight_tmc]
>  [<ffffffc07bb7280c>] alloc_etr_buf.constprop.0.isra.0+0x74/0xa8 [coresight_tmc]
>  [<ffffffc07bb72950>] tmc_alloc_etr_buffer+0x110/0x260 [coresight_tmc]
>  [<ffffffc07bb38afc>] etm_setup_aux+0x204/0x3b0 [coresight]
>  [<ffffffc08025837c>] rb_alloc_aux+0x20c/0x318
>  [<ffffffc08024dd84>] perf_mmap+0x2e4/0x7a0
>  [<ffffffc0802cceb0>] mmap_region+0x3b0/0xa08
>  [<ffffffc0802cd8a8>] do_mmap+0x3a0/0x500
>  [<ffffffc080295328>] vm_mmap_pgoff+0x100/0x1d0
>  [<ffffffc0802cadf8>] ksys_mmap_pgoff+0xb8/0x110
>  [<ffffffc080020688>] __arm64_sys_mmap+0x38/0x58
>  [<ffffffc080028fc0>] invoke_syscall.constprop.0+0x58/0x100
> 
> [...]

Applied, thanks!

[1/1] coresight: tmc: sg: Do not leak sg_table
      https://git.kernel.org/coresight/c/c58dc5a1f886f2fcc1133746d0cbaa1fe7fd44ff

Best regards,
-- 
Suzuki K Poulose <suzuki.poulose@....com>