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--- fs/buffer.c-original 2007-01-27 14:46:34.000000000 +1100
+++ fs/buffer.c 2007-01-27 14:51:17.000000000 +1100
@@ -1179,6 +1179,19 @@
} while ((size << sizebits) < PAGE_SIZE);
index = block >> sizebits;
+ /*
+ * Check for a block which wants to lie outside our maximum possible
+ * pagecache index. (this comparison is done using sector_t types).
+ */
+ if (unlikely(index != block >> sizebits)) {
+ char b[BDEVNAME_SIZE];
+
+ printk(KERN_ERR "%s: requested out-of-range block %llu for "
+ "device %s\n",
+ __FUNCTION__, (unsigned long long)block,
+ bdevname(bdev, b));
+ return -EIO;
+ }
block = index << sizebits;
/* Create a page with the proper size buffers.. */
@@ -1207,12 +1220,16 @@
for (;;) {
struct buffer_head * bh;
+ int ret;
bh = __find_get_block(bdev, block, size);
if (bh)
return bh;
- if (!grow_buffers(bdev, block, size))
+ ret = grow_buffers(bdev, block, size);
+ if (ret < 0)
+ return NULL;
+ if (ret == 0)
free_more_memory();
}
}
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