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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
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6
block/raw-posix.c
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@ -391,8 +391,12 @@ static int raw_pread(BlockDriverState *bs, int64_t offset,
size = ALIGNED_BUFFER_SIZE; size = ALIGNED_BUFFER_SIZE;
ret = raw_pread_aligned(bs, offset, s->aligned_buf, size); ret = raw_pread_aligned(bs, offset, s->aligned_buf, size);
if (ret < 0) if (ret < 0) {
return ret; return ret;
} else if (ret == 0) {
fprintf(stderr, "raw_pread: read beyond end of file\n");
abort();
}
size = ret; size = ret;
if (size > count) if (size > count)