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coda: use vmemdup_user to replace the open code

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vmemdup_user is better than duplicating its implementation, So just
replace the open code.

  fs/coda/psdev.c:125:10-18:WARNING:opportunity for vmemdup_user

The issue is detected with the help of Coccinelle.

Link: https://lkml.kernel.org/r/20210908140308.18491-9-jaharkes@cs.cmu.edu
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Jing Yangyang <jing.yangyang@zte.com.cn>
Signed-off-by: Jan Harkes <jaharkes@cs.cmu.edu>
Cc: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Xin Tan <tanxin.ctf@gmail.com>
Cc: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jing Yangyang 2021-11-08 18:34:52 -08:00 committed by Linus Torvalds
parent 1077c28577
commit 118b7ee169
1 changed files with 4 additions and 8 deletions
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12
fs/coda/psdev.c
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@ -122,14 +122,10 @@ static ssize_t coda_psdev_write(struct file *file, const char __user *buf,
hdr.opcode, hdr.unique);
nbytes = size;
}
dcbuf = kvmalloc(nbytes, GFP_KERNEL);
if (!dcbuf) {
retval = -ENOMEM;
goto out;
}
if (copy_from_user(dcbuf, buf, nbytes)) {
kvfree(dcbuf);
retval = -EFAULT;
dcbuf = vmemdup_user(buf, nbytes);
if (IS_ERR(dcbuf)) {
retval = PTR_ERR(dcbuf);
goto out;
}