diff options
| author | Sam Bobroff | 2018-05-25 13:11:30 +1000 |
|---|---|---|
| committer | Michael Ellerman | 2018-06-03 20:43:38 +1000 |
| commit | 46d4be41b987a6b2d25a2ebdd94cafb44e21d6c5 (patch) | |
| tree | 13e0bbf0b3cf0d0cd47e59ebd18df94d5058d444 /arch/powerpc/kernel | |
| parent | 796b9f5b317a46d1b744f661c38a62b1280a6ab7 (diff) | |
powerpc/eeh: Fix use-after-release of EEH driver
Correct two cases where eeh_pcid_get() is used to reference the driver's
module but the reference is dropped before the driver pointer is used.
In eeh_rmv_device() also refactor a little so that only two calls to
eeh_pcid_put() are needed, rather than three and the reference isn't
taken at all if it wasn't needed.
Signed-off-by: Sam Bobroff <sbobroff@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/eeh_driver.c | 28 |
1 files changed, 16 insertions, 12 deletions
diff --git a/arch/powerpc/kernel/eeh_driver.c b/arch/powerpc/kernel/eeh_driver.c index 07e0a42035ce..54333f6c9d67 100644 --- a/arch/powerpc/kernel/eeh_driver.c +++ b/arch/powerpc/kernel/eeh_driver.c @@ -458,9 +458,11 @@ static void *eeh_add_virt_device(void *data, void *userdata) driver = eeh_pcid_get(dev); if (driver) { - eeh_pcid_put(dev); - if (driver->err_handler) + if (driver->err_handler) { + eeh_pcid_put(dev); return NULL; + } + eeh_pcid_put(dev); } #ifdef CONFIG_PCI_IOV @@ -497,17 +499,19 @@ static void *eeh_rmv_device(void *data, void *userdata) if (eeh_dev_removed(edev)) return NULL; - driver = eeh_pcid_get(dev); - if (driver) { - eeh_pcid_put(dev); - if (removed && - eeh_pe_passed(edev->pe)) - return NULL; - if (removed && - driver->err_handler && - driver->err_handler->error_detected && - driver->err_handler->slot_reset) + if (removed) { + if (eeh_pe_passed(edev->pe)) return NULL; + driver = eeh_pcid_get(dev); + if (driver) { + if (driver->err_handler && + driver->err_handler->error_detected && + driver->err_handler->slot_reset) { + eeh_pcid_put(dev); + return NULL; + } + eeh_pcid_put(dev); + } } /* Remove it from PCI subsystem */ |