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block/bochs: improve format checking

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Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Blue Swirl 2009-12-25 19:27:18 +00:00
parent 114cdfa908
commit ecbe1576b3
1 changed files with 10 additions and 3 deletions
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13
block/bochs.c
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@ -146,7 +146,9 @@ static int bochs_open(BlockDriverState *bs, const char *filename, int flags)
bs->total_sectors = le64_to_cpu(bochs.extra.redolog.disk) / 512;
}
lseek(s->fd, le32_to_cpu(bochs.header), SEEK_SET);
if (lseek(s->fd, le32_to_cpu(bochs.header), SEEK_SET) == (off_t)-1) {
goto fail;
}
s->catalog_size = le32_to_cpu(bochs.extra.redolog.catalog);
s->catalog_bitmap = qemu_malloc(s->catalog_size * 4);
@ -197,7 +199,10 @@ static inline int seek_to_sector(BlockDriverState *bs, int64_t sector_num)
// bitmap_offset, block_offset);
// read in bitmap for current extent
lseek(s->fd, bitmap_offset + (extent_offset / 8), SEEK_SET);
if (lseek(s->fd, bitmap_offset + (extent_offset / 8), SEEK_SET) ==
(off_t)-1) {
return -1;
}
if (read(s->fd, &bitmap_entry, 1) != 1)
return -1;
@ -209,7 +214,9 @@ static inline int seek_to_sector(BlockDriverState *bs, int64_t sector_num)
return -1; // not allocated
}
lseek(s->fd, block_offset, SEEK_SET);
if (lseek(s->fd, block_offset, SEEK_SET) == (off_t)-1) {
return -1;
}
return 0;
}