OpenE2K
/
qemu-e2k
13
4
Fork 0
Code Issues 4 Pull Requests Projects 2 Releases Activity

block/raw-posix: Abort on pread beyond end of non-growable file 

This shouldn't happen under any normal circumstances. However, it looks like
it's possible to achieve this with corrupted images. Without this patch
raw_pread is hanging in an endless loop in such cases.

The patch is not affecting growable files, for which such reads happen in
normal use cases. raw_pread_aligned already handles these cases and won't
return zero in the first place.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Kevin Wolf 2010-01-22 14:26:38 +01:00 committed by Anthony Liguori
parent f8a83245d9
commit 053965c7ff
1 changed files with 5 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
block/raw-posix.c
View File

@ -391,8 +391,12 @@ static int raw_pread(BlockDriverState *bs, int64_t offset,
size = ALIGNED_BUFFER_SIZE;
ret = raw_pread_aligned(bs, offset, s->aligned_buf, size);
if (ret < 0)
if (ret < 0) {
return ret;
} else if (ret == 0) {
fprintf(stderr, "raw_pread: read beyond end of file\n");
abort();
}
size = ret;
if (size > count)