staging/lustre/llite: error of listxattr when buffer is small
According to the standard, listxattr(2) should return -1 and errno should be set to ERANGE if the size of the list buffer is too small to hold the result. However ll_listxattr() will return a value bigger than the size of buffer in some cases. Let's assume listxattr(2) returns SIZE when it is called with a large enough list buffer. If it's called again with a list buffer whose size is smaller than SIZE but bigger than (SIZE - 12), then listxattr(2) will return SIZE too. This patch fixes the problem. Original patch by Li Xi <pkuelelixi@gmail.com> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3403 Lustre-change: http://review.whamcloud.com/6463 Signed-off-by: Keith Mannthey <keith.mannthey@intel.com> Reviewed-by: Li Xi <pkuelelixi@gmail.com> Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com> Reviewed-by: Oleg Drokin <oleg.drokin@intel.com> Signed-off-by: Peng Tao <tao.peng@emc.com> Signed-off-by: Andreas Dilger <andreas.dilger@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -564,7 +564,12 @@ ssize_t ll_listxattr(struct dentry *dentry, char *buffer, size_t size)
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const size_t name_len = sizeof("lov") - 1;
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const size_t total_len = prefix_len + name_len + 1;
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if (buffer && (rc + total_len) <= size) {
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if (((rc + total_len) > size) && (buffer != NULL)) {
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ptlrpc_req_finished(request);
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return -ERANGE;
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}
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if (buffer != NULL) {
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buffer += rc;
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memcpy(buffer, XATTR_LUSTRE_PREFIX, prefix_len);
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memcpy(buffer + prefix_len, "lov", name_len);
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