omfs: fix potential integer overflow in allocator
Both 'i' and 'bits_per_entry' are signed integers but the result is a
u64 block number. Cast i to u64 to avoid truncation on 32-bit targets.
Found by Coverity (CID 200679).
Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/omfs/bitmap.c b/fs/omfs/bitmap.c
index 0822345..83f4e76 100644
--- a/fs/omfs/bitmap.c
+++ b/fs/omfs/bitmap.c
@@ -159,7 +159,7 @@
goto out;
found:
- *return_block = i * bits_per_entry + bit;
+ *return_block = (u64) i * bits_per_entry + bit;
*return_size = run;
ret = set_run(sb, i, bits_per_entry, bit, run, 1);