提交 a248ce06 编写于 作者: R Rickard Strandqvist 提交者: Takashi Iwai

staging: line6: toneport.c: Fix for possible null pointer dereference

The NULL check was done to late, and there it was a risk
of a possible null pointer dereference.

This was partially found by using a static code analysis program called cppcheck.
Signed-off-by: NRickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Reviewed-by: NStefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>
上级 eaa27f34
master alk-4.19.24 alk-4.19.30 alk-4.19.34 alk-4.19.36 alk-4.19.43 alk-4.19.48 alk-4.19.57 ck-4.19.67 ck-4.19.81 ck-4.19.91 github/fork/deepanshu1422/fix-typo-in-comment github/fork/haosdent/fix-typo linux-next v4.19.91 v4.19.90 v4.19.89 v4.19.88 v4.19.87 v4.19.86 v4.19.85 v4.19.84 v4.19.83 v4.19.82 v4.19.81 v4.19.80 v4.19.79 v4.19.78 v4.19.77 v4.19.76 v4.19.75 v4.19.74 v4.19.73 v4.19.72 v4.19.71 v4.19.70 v4.19.69 v4.19.68 v4.19.67 v4.19.66 v4.19.65 v4.19.64 v4.19.63 v4.19.62 v4.19.61 v4.19.60 v4.19.59 v4.19.58 v4.19.57 v4.19.56 v4.19.55 v4.19.54 v4.19.53 v4.19.52 v4.19.51 v4.19.50 v4.19.49 v4.19.48 v4.19.47 v4.19.46 v4.19.45 v4.19.44 v4.19.43 v4.19.42 v4.19.41 v4.19.40 v4.19.39 v4.19.38 v4.19.37 v4.19.36 v4.19.35 v4.19.34 v4.19.33 v4.19.32 v4.19.31 v4.19.30 v4.19.29 v4.19.28 v4.19.27 v4.19.26 v4.19.25 v4.19.24 v4.19.23 v4.19.22 v4.19.21 v4.19.20 v4.19.19 v4.19.18 v4.19.17 v4.19.16 v4.19.15 v4.19.14 v4.19.13 v4.19.12 v4.19.11 v4.19.10 v4.19.9 v4.19.8 v4.19.7 v4.19.6 v4.19.5 v4.19.4 v4.19.3 v4.19.2 v4.19.1 v4.19 v4.19-rc8 v4.19-rc7 v4.19-rc6 v4.19-rc5 v4.19-rc4 v4.19-rc3 v4.19-rc2 v4.19-rc1 ck-release-21 ck-release-20 ck-release-19.2 ck-release-19.1 ck-release-19 ck-release-18 ck-release-17.2 ck-release-17.1 ck-release-17 ck-release-16 ck-release-15.1 ck-release-15 ck-release-14 ck-release-13.2 ck-release-13 ck-release-12 ck-release-11 ck-release-10 ck-release-9 ck-release-7 alk-release-15 alk-release-14 alk-release-13.2 alk-release-13 alk-release-12 alk-release-11 alk-release-10 alk-release-9 alk-release-7
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...@@ -433,12 +433,16 @@ void line6_toneport_reset_resume(struct usb_line6_toneport *toneport) ...@@ -433,12 +433,16 @@ void line6_toneport_reset_resume(struct usb_line6_toneport *toneport)
void line6_toneport_disconnect(struct usb_interface *interface) void line6_toneport_disconnect(struct usb_interface *interface)
{ {
struct usb_line6_toneport *toneport; struct usb_line6_toneport *toneport;
struct snd_line6_pcm *line6pcm;
u16 idProduct; u16 idProduct;
if (interface == NULL) if (interface == NULL)
return; return;
toneport = usb_get_intfdata(interface); toneport = usb_get_intfdata(interface);
if (NULL == toneport)
return;
del_timer_sync(&toneport->timer); del_timer_sync(&toneport->timer);
idProduct = le16_to_cpu(toneport->line6.usbdev->descriptor.idProduct); idProduct = le16_to_cpu(toneport->line6.usbdev->descriptor.idProduct);
...@@ -447,13 +451,10 @@ void line6_toneport_disconnect(struct usb_interface *interface) ...@@ -447,13 +451,10 @@ void line6_toneport_disconnect(struct usb_interface *interface)
device_remove_file(&interface->dev, &dev_attr_led_green); device_remove_file(&interface->dev, &dev_attr_led_green);
} }
if (toneport != NULL) { line6pcm = toneport->line6.line6pcm;
struct snd_line6_pcm *line6pcm = toneport->line6.line6pcm; if (line6pcm != NULL) {
line6_pcm_release(line6pcm, LINE6_BITS_PCM_MONITOR);
if (line6pcm != NULL) { line6_pcm_disconnect(line6pcm);
line6_pcm_release(line6pcm, LINE6_BITS_PCM_MONITOR);
line6_pcm_disconnect(line6pcm);
}
} }
toneport_destruct(interface); toneport_destruct(interface);
......
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