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efi/efi_test: Use memdup_user() helper 

Use memdup_user() helper instead of open-coding to simplify the code.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Ivan Hu <ivan.hu@canonical.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20170602135207.21708-12-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Geliang Tang 2017-06-02 13:52:05 +00:00 committed by Ingo Molnar
parent 2959c95d51
commit 5f72cad65c
1 changed files with 3 additions and 8 deletions
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11
drivers/firmware/efi/test/efi_test.c
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@ -71,18 +71,13 @@ copy_ucs2_from_user_len(efi_char16_t **dst, efi_char16_t __user *src,
if (!access_ok(VERIFY_READ, src, 1))
return -EFAULT;
buf = kmalloc(len, GFP_KERNEL);
if (!buf) {
buf = memdup_user(src, len);
if (IS_ERR(buf)) {
*dst = NULL;
return -ENOMEM;
return PTR_ERR(buf);
}
*dst = buf;
if (copy_from_user(*dst, src, len)) {
kfree(buf);
return -EFAULT;
}
return 0;
}