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s390/crash: fix incorrect number of bytes to copy to user space

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[ Upstream commit f6749da17a34eb08c9665f072ce7c812ff68aad2 ]

The number of bytes in a chunk is correctly calculated, but instead
the total number of bytes is passed to copy_to_user_real() function.

Reported-by: Matthew Wilcox <willy@infradead.org>
Fixes: df9694c7975f ("s390/dump: streamline oldmem copy functions")
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alexander Gordeev 2022-07-15 12:59:33 +02:00 committed by Greg Kroah-Hartman
parent 951183192a
commit 8108b1f018
1 changed files with 1 additions and 1 deletions
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2
arch/s390/kernel/crash_dump.c
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@ -199,7 +199,7 @@ static int copy_oldmem_user(void __user *dst, unsigned long src, size_t count)
} else {
len = count;
}
rc = copy_to_user_real(dst, src, count);
rc = copy_to_user_real(dst, src, len);
if (rc)
return rc;
}