Dan Carpenter 5c21186c5f NTB: ntb_tool: uninitialized heap data in tool_fn_write() ... commit 45e1058b77 upstream. The call to: ret = simple_write_to_buffer(buf, size, offp, ubuf, size); will return success if it is able to write even one byte to "buf". The value of "*offp" controls which byte. This could result in reading uninitialized data when we do the sscanf() on the next line. This code is not really desigined to handle partial writes where *offp is non-zero and the "buf" is preserved and re-used between writes. Just ban partial writes and replace the simple_write_to_buffer() with copy_from_user(). Fixes: 578b881ba9 ("NTB: Add tool test client") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Jon Mason <jdmason@kudzu.us> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-08-25 11:40:14 +02:00
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test	NTB: ntb_tool: uninitialized heap data in tool_fn_write()	2022-08-25 11:40:14 +02:00
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