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1a31cb2782
syzbot reported a uninit-value in pctv452e_i2c_msg. [1] When the snd_len or rcv_len check fails and jumps to failed, buf is uninitialized, triggering the uninit-value issue. Move the snd/rcv length check before kmalloc, and return -EINVAL directly if the condition is met. [1] BUG: KMSAN: uninit-value in hex_string+0x681/0x740 lib/vsprintf.c:1220 pctv452e_i2c_msg+0x82a/0x8f0 drivers/media/usb/dvb-usb/pctv452e.c:467 pctv452e_i2c_xfer+0x2e6/0x4c0 drivers/media/usb/dvb-usb/pctv452e.c:502 Reported-by: syzbot+480edd2cadb85ddb4bbe@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=480edd2cadb85ddb4bbe Signed-off-by: Edward Adam Davis <eadavis@qq.com> Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.