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| author | Wang Hai <wanghai38@huawei.com> | 2021-10-13 08:16:31 +0200 |
|---|---|---|
| committer | Damien Le Moal <damien.lemoal@wdc.com> | 2021-10-14 05:22:47 +0200 |
| commit | 776c75010803849c1cc4f11031a2b3960ab05202 (patch) | |
| tree | e51c86b3ab4ae1e796b7f89d5569d4f3cff4e3fe /drivers/ata | |
| parent | pata_legacy: fix a couple uninitialized variable bugs (diff) | |
| download | linux-776c75010803849c1cc4f11031a2b3960ab05202.tar.xz linux-776c75010803849c1cc4f11031a2b3960ab05202.zip | |
ata: ahci_platform: fix null-ptr-deref in ahci_platform_enable_regulators()
I got a null-ptr-deref report:
KASAN: null-ptr-deref in range [0x0000000000000090-0x0000000000000097]
...
RIP: 0010:regulator_enable+0x84/0x260
...
Call Trace:
ahci_platform_enable_regulators+0xae/0x320
ahci_platform_enable_resources+0x1a/0x120
ahci_probe+0x4f/0x1b9
platform_probe+0x10b/0x280
...
entry_SYSCALL_64_after_hwframe+0x44/0xae
If devm_regulator_get() in ahci_platform_get_resources() fails,
hpriv->phy_regulator will point to NULL, when enabling or disabling it,
null-ptr-deref will occur.
ahci_probe()
ahci_platform_get_resources()
devm_regulator_get(, "phy") // failed, let phy_regulator = NULL
ahci_platform_enable_resources()
ahci_platform_enable_regulators()
regulator_enable(hpriv->phy_regulator) // null-ptr-deref
commit 962399bb7fbf ("ata: libahci_platform: Fix regulator_get_optional()
misuse") replaces devm_regulator_get_optional() with devm_regulator_get(),
but PHY regulator omits to delete "hpriv->phy_regulator = NULL;" like AHCI.
Delete it like AHCI regulator to fix this bug.
Fixes: commit 962399bb7fbf ("ata: libahci_platform: Fix regulator_get_optional() misuse")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wang Hai <wanghai38@huawei.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Diffstat (limited to 'drivers/ata')
| -rw-r--r-- | drivers/ata/libahci_platform.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c index b2f552088291..0910441321f7 100644 --- a/drivers/ata/libahci_platform.c +++ b/drivers/ata/libahci_platform.c @@ -440,10 +440,7 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev, hpriv->phy_regulator = devm_regulator_get(dev, "phy"); if (IS_ERR(hpriv->phy_regulator)) { rc = PTR_ERR(hpriv->phy_regulator); - if (rc == -EPROBE_DEFER) - goto err_out; - rc = 0; - hpriv->phy_regulator = NULL; + goto err_out; } if (flags & AHCI_PLATFORM_GET_RESETS) { |