From: kernel test robot <lkp@intel.com>
To: kbuild@lists.01.org
Subject: drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.c:57 mt7921_acpi_read() error: dereferencing freed memory 'sar_root'
Date: Mon, 15 Aug 2022 19:29:18 +0800 [thread overview]
Message-ID: <202208151913.eVjlCUfV-lkp@intel.com> (raw)
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BCC: lkp(a)intel.com
CC: kbuild-all(a)lists.01.org
CC: linux-kernel(a)vger.kernel.org
TO: Deren Wu <deren.wu@mediatek.com>
CC: Felix Fietkau <nbd@nbd.name>
CC: Sean Wang <sean.wang@mediatek.com>
CC: Quan Zhou <quan.zhou@mediatek.com>
CC: Ming Yen Hsieh <mingyen.hsieh@mediatek.com>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 568035b01cfb107af8d2e4bd2fb9aea22cf5b868
commit: f965333e491e36adb0fa91e389fba8685b704fb6 mt76: mt7921: introduce ACPI SAR support
date: 5 weeks ago
:::::: branch date: 13 hours ago
:::::: commit date: 5 weeks ago
config: ia64-randconfig-m031-20220814 (https://download.01.org/0day-ci/archive/20220815/202208151913.eVjlCUfV-lkp(a)intel.com/config)
compiler: ia64-linux-gcc (GCC) 12.1.0
If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
smatch warnings:
drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.c:57 mt7921_acpi_read() error: dereferencing freed memory 'sar_root'
vim +/sar_root +57 drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.c
f965333e491e36 Deren Wu 2022-05-20 6
f965333e491e36 Deren Wu 2022-05-20 7 static int
f965333e491e36 Deren Wu 2022-05-20 8 mt7921_acpi_read(struct mt7921_dev *dev, u8 *method, u8 **tbl, u32 *len)
f965333e491e36 Deren Wu 2022-05-20 9 {
f965333e491e36 Deren Wu 2022-05-20 10 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
f965333e491e36 Deren Wu 2022-05-20 11 union acpi_object *sar_root, *sar_unit;
f965333e491e36 Deren Wu 2022-05-20 12 struct mt76_dev *mdev = &dev->mt76;
f965333e491e36 Deren Wu 2022-05-20 13 acpi_handle root, handle;
f965333e491e36 Deren Wu 2022-05-20 14 acpi_status status;
f965333e491e36 Deren Wu 2022-05-20 15 u32 i = 0;
f965333e491e36 Deren Wu 2022-05-20 16
f965333e491e36 Deren Wu 2022-05-20 17 root = ACPI_HANDLE(mdev->dev);
f965333e491e36 Deren Wu 2022-05-20 18 if (!root)
f965333e491e36 Deren Wu 2022-05-20 19 return -EOPNOTSUPP;
f965333e491e36 Deren Wu 2022-05-20 20
f965333e491e36 Deren Wu 2022-05-20 21 status = acpi_get_handle(root, method, &handle);
f965333e491e36 Deren Wu 2022-05-20 22 if (ACPI_FAILURE(status))
f965333e491e36 Deren Wu 2022-05-20 23 return -EIO;
f965333e491e36 Deren Wu 2022-05-20 24
f965333e491e36 Deren Wu 2022-05-20 25 status = acpi_evaluate_object(handle, NULL, NULL, &buf);
f965333e491e36 Deren Wu 2022-05-20 26 if (ACPI_FAILURE(status))
f965333e491e36 Deren Wu 2022-05-20 27 return -EIO;
f965333e491e36 Deren Wu 2022-05-20 28
f965333e491e36 Deren Wu 2022-05-20 29 sar_root = buf.pointer;
f965333e491e36 Deren Wu 2022-05-20 30 if (sar_root->type != ACPI_TYPE_PACKAGE ||
f965333e491e36 Deren Wu 2022-05-20 31 sar_root->package.count < 4 ||
f965333e491e36 Deren Wu 2022-05-20 32 sar_root->package.elements[0].type != ACPI_TYPE_INTEGER) {
f965333e491e36 Deren Wu 2022-05-20 33 dev_err(mdev->dev, "sar cnt = %d\n",
f965333e491e36 Deren Wu 2022-05-20 34 sar_root->package.count);
f965333e491e36 Deren Wu 2022-05-20 35 goto free;
f965333e491e36 Deren Wu 2022-05-20 36 }
f965333e491e36 Deren Wu 2022-05-20 37
f965333e491e36 Deren Wu 2022-05-20 38 if (!*tbl) {
f965333e491e36 Deren Wu 2022-05-20 39 *tbl = devm_kzalloc(mdev->dev, sar_root->package.count,
f965333e491e36 Deren Wu 2022-05-20 40 GFP_KERNEL);
f965333e491e36 Deren Wu 2022-05-20 41 if (!*tbl)
f965333e491e36 Deren Wu 2022-05-20 42 goto free;
f965333e491e36 Deren Wu 2022-05-20 43 }
f965333e491e36 Deren Wu 2022-05-20 44 if (len)
f965333e491e36 Deren Wu 2022-05-20 45 *len = sar_root->package.count;
f965333e491e36 Deren Wu 2022-05-20 46
f965333e491e36 Deren Wu 2022-05-20 47 for (i = 0; i < sar_root->package.count; i++) {
f965333e491e36 Deren Wu 2022-05-20 48 sar_unit = &sar_root->package.elements[i];
f965333e491e36 Deren Wu 2022-05-20 49
f965333e491e36 Deren Wu 2022-05-20 50 if (sar_unit->type != ACPI_TYPE_INTEGER)
f965333e491e36 Deren Wu 2022-05-20 51 break;
f965333e491e36 Deren Wu 2022-05-20 52 *(*tbl + i) = (u8)sar_unit->integer.value;
f965333e491e36 Deren Wu 2022-05-20 53 }
f965333e491e36 Deren Wu 2022-05-20 54 free:
f965333e491e36 Deren Wu 2022-05-20 55 kfree(sar_root);
f965333e491e36 Deren Wu 2022-05-20 56
f965333e491e36 Deren Wu 2022-05-20 @57 return (i == sar_root->package.count) ? 0 : -EINVAL;
f965333e491e36 Deren Wu 2022-05-20 58 }
f965333e491e36 Deren Wu 2022-05-20 59
--
0-DAY CI Kernel Test Service
https://01.org/lkp
next reply other threads:[~2022-08-15 11:29 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-15 11:29 kernel test robot [this message]
-- strict thread matches above, loose matches on Subject: below --
2022-08-16 10:10 drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.c:57 mt7921_acpi_read() error: dereferencing freed memory 'sar_root' kernel test robot
2022-08-18 7:48 kernel test robot
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