From 071982ba0f9b360ef407fd84c20dac75eb0dd6af Mon Sep 17 00:00:00 2001 From: Marcus Holland-Moritz Date: Tue, 30 Mar 2021 17:45:36 +0200 Subject: [PATCH] Improved error message when using an empty filesystem file --- src/dwarfs/mmap.cpp | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/src/dwarfs/mmap.cpp b/src/dwarfs/mmap.cpp index 9f2bfcdd..60d1035f 100644 --- a/src/dwarfs/mmap.cpp +++ b/src/dwarfs/mmap.cpp @@ -56,6 +56,10 @@ size_t safe_size(int fd) { } void* safe_mmap(int fd, size_t size) { + if (size == 0) { + DWARFS_THROW(runtime_error, "empty file"); + } + void* addr = ::mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0); if (addr == MAP_FAILED) { @@ -64,6 +68,7 @@ void* safe_mmap(int fd, size_t size) { return addr; } + } // namespace boost::system::error_code mmap::lock(off_t offset, size_t size) {