dedup

commit c0f3292de8c30657c13d7564a0655e65df8e0459
parent bf3abd9cb6cf698a89cddc3fbd635cf6d6bed45c
Author: sin <sin@2f30.org>
Date:   Wed, 21 Mar 2018 11:12:19 +0000

Ensure block pointer in the index file is within limits

Diffstat:
M
dedup.c
 | 
6
++++--

1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/dedup.c b/dedup.c
@@ -267,6 +267,8 @@ extract(unsigned char *id, int fd)
 			for (j = 0; j < ent->nblks; j++) {
 				struct blk blk;
 
+				if (ent->blks[j] > nblks())
+					errx(1, "index is corrupted");
 				read_blk(&blk, ent->blks[j]);
 				xwrite(1, blk.data, blk.sz);
 			}
@@ -327,8 +329,8 @@ check(void)
 		for (j = 0; j < ent->nblks; j++) {
 			struct blk blk;
 
-			/* XXX: If there's file corruption, ent->blks[j]
-			 * could point anywhere */
+			if (ent->blks[j] > nblks())
+				errx(1, "index is corrupted");
 			read_blk(&blk, ent->blks[j]);
 			SHA256_Update(&ctx, blk.data, blk.sz);
 		}