FileMap::create: remove duplicate addition.
The previous change was intended to detect the overflow, but
accidentally retained the existing addition, so we'd abort before
getting to the explicit check.
Also reformat slightly to better match the current code in qt-dev and
beyond, to reduce merge conflicts.
Bug: 156997193
Test: treehugger
Change-Id: I73a3a4e75f0aad00888e8f2b49a07b7e8b4eda05
Merged-In: I73a3a4e75f0aad00888e8f2b49a07b7e8b4eda05
diff --git a/libutils/FileMap.cpp b/libutils/FileMap.cpp
index b9f411e..45ca853 100644
--- a/libutils/FileMap.cpp
+++ b/libutils/FileMap.cpp
@@ -160,12 +160,6 @@
return false;
}
#else // !defined(__MINGW32__)
- int prot, flags, adjust;
- off64_t adjOffset;
- size_t adjLength;
-
- void* ptr;
-
assert(fd >= 0);
assert(offset >= 0);
assert(length > 0);
@@ -179,20 +173,19 @@
}
}
- adjust = offset % mPageSize;
- adjOffset = offset - adjust;
- adjLength = length + adjust;
+ int adjust = offset % mPageSize;
+ off64_t adjOffset = offset - adjust;
+ size_t adjLength;
if (__builtin_add_overflow(length, adjust, &adjLength)) {
ALOGE("adjusted length overflow: length %zu adjust %d", length, adjust);
return false;
}
- flags = MAP_SHARED;
- prot = PROT_READ;
- if (!readOnly)
- prot |= PROT_WRITE;
+ int flags = MAP_SHARED;
+ int prot = PROT_READ;
+ if (!readOnly) prot |= PROT_WRITE;
- ptr = mmap(NULL, adjLength, prot, flags, fd, adjOffset);
+ void* ptr = mmap(nullptr, adjLength, prot, flags, fd, adjOffset);
if (ptr == MAP_FAILED) {
ALOGE("mmap(%lld,%zu) failed: %s\n",
(long long)adjOffset, adjLength, strerror(errno));