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authorDavid Kalnischkies <kalnischkies@gmail.com>2013-07-26 12:20:50 +0200
committerDavid Kalnischkies <kalnischkies@gmail.com>2013-07-26 12:20:50 +0200
commit638593bd058fc0c715a76de92ff5bd6691c101e4 (patch)
treeafd7270b39ab79283bfb32f1e5553de4d4d88752 /apt-pkg/contrib/fileutl.cc
parent9ca0d58180366275f5e62b6c5aad066b7b09a1de (diff)
ensure that FileFd::Size returns 0 in error cases
Diffstat (limited to 'apt-pkg/contrib/fileutl.cc')
-rw-r--r--apt-pkg/contrib/fileutl.cc23
1 files changed, 18 insertions, 5 deletions
diff --git a/apt-pkg/contrib/fileutl.cc b/apt-pkg/contrib/fileutl.cc
index 0f88923cf..5debb4f92 100644
--- a/apt-pkg/contrib/fileutl.cc
+++ b/apt-pkg/contrib/fileutl.cc
@@ -1598,7 +1598,11 @@ unsigned long long FileFd::Size()
char ignore[1000];
unsigned long long read = 0;
do {
- Read(ignore, sizeof(ignore), &read);
+ if (Read(ignore, sizeof(ignore), &read) == false)
+ {
+ Seek(oldSeek);
+ return 0;
+ }
} while(read != 0);
size = Tell();
Seek(oldSeek);
@@ -1615,10 +1619,16 @@ unsigned long long FileFd::Size()
* bits of the file */
// FIXME: Size for gz-files is limited by 32bit… no largefile support
if (lseek(iFd, -4, SEEK_END) < 0)
- return FileFdErrno("lseek","Unable to seek to end of gzipped file");
- size = 0L;
+ {
+ FileFdErrno("lseek","Unable to seek to end of gzipped file");
+ return 0;
+ }
+ size = 0;
if (read(iFd, &size, 4) != 4)
- return FileFdErrno("read","Unable to read original size of gzipped file");
+ {
+ FileFdErrno("read","Unable to read original size of gzipped file");
+ return 0;
+ }
#ifdef WORDS_BIGENDIAN
uint32_t tmp_size = size;
@@ -1628,7 +1638,10 @@ unsigned long long FileFd::Size()
#endif
if (lseek(iFd, oldPos, SEEK_SET) < 0)
- return FileFdErrno("lseek","Unable to seek in gzipped file");
+ {
+ FileFdErrno("lseek","Unable to seek in gzipped file");
+ return 0;
+ }
return size;
}