The amount of diskspace needed for a transaction can be less than
zero.  Only test this against the available disk space if it is
positive, which avoids a comparison being made between signed and
unsigned types (-Wsign-compare).

Signed-off-by: Allan McRae <[email protected]>
---
 lib/libalpm/diskspace.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/lib/libalpm/diskspace.c b/lib/libalpm/diskspace.c
index cc2e7a9..880df62 100644
--- a/lib/libalpm/diskspace.c
+++ b/lib/libalpm/diskspace.c
@@ -302,7 +302,8 @@ int _alpm_check_diskspace(pmtrans_t *trans, pmdb_t 
*db_local)
                        _alpm_log(PM_LOG_DEBUG, "partition %s, needed %ld, 
cushion %ld, free %ld\n",
                                        data->mount_dir, 
data->max_blocks_needed, cushion,
                                        (unsigned long)data->fsp.f_bfree);
-                       if(data->max_blocks_needed + cushion > 
data->fsp.f_bfree) {
+                       if(data->max_blocks_needed + cushion >= 0 &&
+                          (unsigned long)(data->max_blocks_needed + cushion) > 
data->fsp.f_bfree) {
                                abort = 1;
                        }
                }
-- 
1.7.3.3


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