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| author | Maulik Mankad <x0082077@ti.com> | 2009-12-22 16:18:19 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-12-23 11:34:19 -0800 |
| commit | 0abdc36f066ae20521b8c8d306725dd59a0d50aa (patch) | |
| tree | 39b8392093276bb1a5ae3bb68b8ebef8062ad4e3 /drivers/usb | |
| parent | 796a83fa039de50133171221ac102a2310e81ffd (diff) | |
| download | linux-0abdc36f066ae20521b8c8d306725dd59a0d50aa.tar.gz linux-0abdc36f066ae20521b8c8d306725dd59a0d50aa.tar.bz2 linux-0abdc36f066ae20521b8c8d306725dd59a0d50aa.zip | |
USB: musb: Fix null pointer dereference issue
This patch fixes the following NULL pointer dereference issue.
Pointer 'request' returned from call to function 'next_request'
at line 748 may be NULL and may be dereferenced at line 792.
============
Code Snippet
============
748: request = next_request(musb_ep);
785: if (dma && (csr & MUSB_RXCSR_DMAENAB)) {
csr &= ~(MUSB_RXCSR_AUTOCLEAR
| MUSB_RXCSR_DMAENAB
| MUSB_RXCSR_DMAMODE);
musb_writew(epio, MUSB_RXCSR,
MUSB_RXCSR_P_WZC_BITS | csr);
792: request->actual += musb_ep->dma->actual_len;
Signed-off-by: Maulik Mankad <x0082077@ti.com>
Cc: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/musb/musb_gadget.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c index ac306985a8a1..cbcf14a236e6 100644 --- a/drivers/usb/musb/musb_gadget.c +++ b/drivers/usb/musb/musb_gadget.c @@ -746,6 +746,8 @@ void musb_g_rx(struct musb *musb, u8 epnum) musb_ep_select(mbase, epnum); request = next_request(musb_ep); + if (!request) + return; csr = musb_readw(epio, MUSB_RXCSR); dma = is_dma_capable() ? musb_ep->dma : NULL; |