*** BLURB HERE ***
Christophe JAILLET (1): ppdev: Remove usage of the deprecated ida_simple_xx() API
Huai-Yuan Liu (1): ppdev: Add an error check in register_device
drivers/char/ppdev.c | 21 ++++++++++++++------- 1 file changed, 14 insertions(+), 7 deletions(-)
From: Christophe JAILLET christophe.jaillet@wanadoo.fr
mainline inclusion from mainline-v6.8-rc1 commit d8407f71ebeaeb6f50bd89791837873e44609708 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9T6MM
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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ida_alloc() and ida_free() should be preferred to the deprecated ida_simple_get() and ida_simple_remove().
This is less verbose.
Signed-off-by: Christophe JAILLET christophe.jaillet@wanadoo.fr Link: https://lore.kernel.org/r/ba9da12fdd5cdb2c28180b7160af5042447d803f.170296209... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Chen Ridong chenridong@huawei.com --- drivers/char/ppdev.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/char/ppdev.c b/drivers/char/ppdev.c index 51faafd310a2..af74b05d470c 100644 --- a/drivers/char/ppdev.c +++ b/drivers/char/ppdev.c @@ -303,7 +303,7 @@ static int register_device(int minor, struct pp_struct *pp) goto err; }
- index = ida_simple_get(&ida_index, 0, 0, GFP_KERNEL); + index = ida_alloc(&ida_index, GFP_KERNEL); memset(&ppdev_cb, 0, sizeof(ppdev_cb)); ppdev_cb.irq_func = pp_irq; ppdev_cb.flags = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; @@ -314,7 +314,7 @@ static int register_device(int minor, struct pp_struct *pp) if (!pdev) { pr_warn("%s: failed to register device!\n", name); rc = -ENXIO; - ida_simple_remove(&ida_index, index); + ida_free(&ida_index, index); goto err; }
@@ -766,7 +766,7 @@ static int pp_release(struct inode *inode, struct file *file)
if (pp->pdev) { parport_unregister_device(pp->pdev); - ida_simple_remove(&ida_index, pp->index); + ida_free(&ida_index, pp->index); pp->pdev = NULL; pr_debug(CHRDEV "%x: unregistered pardevice\n", minor); }
From: Huai-Yuan Liu qq810974084@gmail.com
mainline inclusion from mainline-v6.10-rc commit fbf740aeb86a4fe82ad158d26d711f2f3be79b3e category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9T6MM CVE: CVE-2024-36015
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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In register_device, the return value of ida_simple_get is unchecked, in witch ida_simple_get will use an invalid index value.
To address this issue, index should be checked after ida_simple_get. When the index value is abnormal, a warning message should be printed, the port should be dropped, and the value should be recorded.
Fixes: 9a69645dde11 ("ppdev: fix registering same device name") Signed-off-by: Huai-Yuan Liu qq810974084@gmail.com Link: https://lore.kernel.org/r/20240412083840.234085-1-qq810974084@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Chen Ridong chenridong@huawei.com --- drivers/char/ppdev.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/drivers/char/ppdev.c b/drivers/char/ppdev.c index af74b05d470c..6422a184a58a 100644 --- a/drivers/char/ppdev.c +++ b/drivers/char/ppdev.c @@ -300,28 +300,35 @@ static int register_device(int minor, struct pp_struct *pp) if (!port) { pr_warn("%s: no associated port!\n", name); rc = -ENXIO; - goto err; + goto err_free_name; }
index = ida_alloc(&ida_index, GFP_KERNEL); + if (index < 0) { + pr_warn("%s: failed to get index!\n", name); + rc = index; + goto err_put_port; + } + memset(&ppdev_cb, 0, sizeof(ppdev_cb)); ppdev_cb.irq_func = pp_irq; ppdev_cb.flags = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; ppdev_cb.private = pp; pdev = parport_register_dev_model(port, name, &ppdev_cb, index); - parport_put_port(port);
if (!pdev) { pr_warn("%s: failed to register device!\n", name); rc = -ENXIO; ida_free(&ida_index, index); - goto err; + goto err_put_port; }
pp->pdev = pdev; pp->index = index; dev_dbg(&pdev->dev, "registered pardevice\n"); -err: +err_put_port: + parport_put_port(port); +err_free_name: kfree(name); return rc; }
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