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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2018-10-26 10:19:51 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-27 16:13:09 +0100 |
| commit | 8600660ce149b32961d0f298eb6cd1c22a161fb1 (patch) | |
| tree | 4d50299932c2d6fa0ae54de46f682c11f2c9b0cd /drivers/uio | |
| parent | a0d5f816c574fe5faaba7c19f4a3b5b11aca8c63 (diff) | |
| download | linux-stable-8600660ce149b32961d0f298eb6cd1c22a161fb1.tar.gz linux-stable-8600660ce149b32961d0f298eb6cd1c22a161fb1.tar.bz2 linux-stable-8600660ce149b32961d0f298eb6cd1c22a161fb1.zip | |
uio: Fix an Oops on load
commit 432798195bbce1f8cd33d1c0284d0538835e25fb upstream.
I was trying to solve a double free but I introduced a more serious
NULL dereference bug. The problem is that if there is an IRQ which
triggers immediately, then we need "info->uio_dev" but it's not set yet.
This patch puts the original initialization back to how it was and just
sets info->uio_dev to NULL on the error path so it should solve both
the Oops and the double free.
Fixes: f019f07ecf6a ("uio: potential double frees if __uio_register_device() fails")
Reported-by: Mathias Thore <Mathias.Thore@infinera.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: stable <stable@vger.kernel.org>
Tested-by: Mathias Thore <Mathias.Thore@infinera.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/uio')
| -rw-r--r-- | drivers/uio/uio.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c index 9916edda5271..2762148c169d 100644 --- a/drivers/uio/uio.c +++ b/drivers/uio/uio.c @@ -959,6 +959,8 @@ int __uio_register_device(struct module *owner, if (ret) goto err_uio_dev_add_attributes; + info->uio_dev = idev; + if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) { /* * Note that we deliberately don't use devm_request_irq @@ -970,11 +972,12 @@ int __uio_register_device(struct module *owner, */ ret = request_irq(info->irq, uio_interrupt, info->irq_flags, info->name, idev); - if (ret) + if (ret) { + info->uio_dev = NULL; goto err_request_irq; + } } - info->uio_dev = idev; return 0; err_request_irq: |