Issue with copy_from_user() function in kernel 3.6.10

[Sudip Mukherjee]

Hi Santosh
Does your destination buffer have sufficient size to hold the data ?

Regards
Sudip

On Fri, Jul 19, 2013 at 7:48 PM, Sateesh Kumar
<sateesh.kumar at redpinesignals.com> wrote:
> Dear Experts,
>
> I am using the kernel 3.6.10 for my driver development. When I compiled
> the code I am getting the following warning. I am facing the same issue
> with 3.5.4 kernel.
>
> "call to ‘copy_from_user_overflow’ declared with attribute warning:
> copy_from_user() buffer size is not provably correct"
>
> When I try to install the module, I am facing the kernel crash. Here is
> the crash log.
>
>
> //Kernel crash log - Start
>
> Call Trace:
> [19592.491229] [<c044bbf2>] warn_slowpath_common+0x72/0xa0
> [19592.491233] [<c06882b7>] ? copy_from_user_overflow+0x27/0x30
> [19592.491236] [<c06882b7>] ? copy_from_user_overflow+0x27/0x30
> [19592.491241] [<f86f54c0>] ? jtag_usb_card_read+0x70/0x70 [usb_jtag]
> [19592.491244] [<c044bcc3>] warn_slowpath_fmt+0x33/0x40
> [19592.491247] [<c06882b7>] copy_from_user_overflow+0x27/0x30
> [19592.491251] [<f86f54ec>] jtag_usb_ioctl+0x2c/0x80 [usb_jtag]
> [19592.491256] [<c0565dea>] do_vfs_ioctl+0x7a/0x590
> [19592.491259] [<c055f41b>] ? putname+0x2b/0x40
> [19592.491262] [<c055f41b>] ? putname+0x2b/0x40
> [19592.491265] [<c0555238>] ? do_sys_open+0x158/0x1c0
> [19592.491269] [<c0566368>] sys_ioctl+0x68/0x80
> [19592.491274] [<c0980cdf>] sysenter_do_call+0x12/0x28
> [19592.491276] ---[ end trace 98bdb358664246ac ]---
> [19592.491277] copy_from_usr error
>
> //Kernel crash log - End
>
>
>
> Please let me know, what wrong with my driver?
>
>
> Thanks in advance,
> Regards,
> Sateesh
>
>
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