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-rw-r--r--net/disk_cache/sparse_control.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/disk_cache/sparse_control.cc b/net/disk_cache/sparse_control.cc
index 509ce78..06912de 100644
--- a/net/disk_cache/sparse_control.cc
+++ b/net/disk_cache/sparse_control.cc
@@ -176,7 +176,7 @@ int SparseControl::StartIO(SparseOperation op, int64 offset, net::IOBuffer* buf,
return net::ERR_INVALID_ARGUMENT;
// We only support up to 64 GB.
- if (offset + buf_len >= 0x1000000000LL)
+ if (offset + buf_len >= 0x1000000000LL || offset + buf_len < 0)
return net::ERR_CACHE_OPERATION_NOT_SUPPORTED;
DCHECK(!user_buf_);