xfs: prevent a WARN_ONCE() in xfs_ioc_attr_list()

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The "bufsize" comes from the root user.  If "bufsize" is negative then,
because of type promotion, neither of the validation checks at the start
of the function are able to catch it:

	if (bufsize < sizeof(struct xfs_attrlist) ||
	    bufsize > XFS_XATTR_LIST_MAX)
		return -EINVAL;

This means "bufsize" will trigger (WARN_ON_ONCE(size > INT_MAX)) in
kvmalloc_node().  Fix this by changing the type from int to size_t.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>

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Dan Carpenter 2021-12-21 09:38:19 -08:00 • committed by Darrick J. Wong

parent 132c460e49

commit 6ed6356b07

2 changed files with 4 additions and 3 deletions

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2

fs/xfs/xfs_ioctl.c

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5

fs/xfs/xfs_ioctl.h

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