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

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Message-Id: <20240702132846.1677261-1-suzuki.poulose@arm.com>
Date: Tue,  2 Jul 2024 14:28:46 +0100
From: Suzuki K Poulose <suzuki.poulose@....com>
To: coresight@...ts.linaro.org
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	anshuman.khandual@....com,
	mike.leach@...aro.org,
	Suzuki K Poulose <suzuki.poulose@....com>,
	James Clark <james.clark@....com>
Subject: [PATCH] coresight: tmc: sg: Do not leak sg_table

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

This due to the fact that we do not free the "sg_table" itself while
freeing up  the SG table and data pages. Fix this by freeing the sg_table
in tmc_free_sg_table().

Fixes: 99443ea19e8b ("coresight: Add generic TMC sg table framework")
Cc: Mike Leach <mike.leach@...aro.org>
Cc: James Clark <james.clark@....com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 drivers/hwtracing/coresight/coresight-tmc-etr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index e75428fa1592..610ad51cda65 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -261,6 +261,7 @@ void tmc_free_sg_table(struct tmc_sg_table *sg_table)
 {
 	tmc_free_table_pages(sg_table);
 	tmc_free_data_pages(sg_table);
+	kfree(sg_table);
 }
 EXPORT_SYMBOL_GPL(tmc_free_sg_table);
 
@@ -342,7 +343,6 @@ struct tmc_sg_table *tmc_alloc_sg_table(struct device *dev,
 		rc = tmc_alloc_table_pages(sg_table);
 	if (rc) {
 		tmc_free_sg_table(sg_table);
-		kfree(sg_table);
 		return ERR_PTR(rc);
 	}
 
-- 
2.34.1