pstore/zone: cap the maximum device size

Introduce an abritrary 128MiB cap to avoid malloc failures when using a larger block device. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: WeiXiong Liao <[email protected]> Reviewed-by: Kees Cook <[email protected]> Signed-off-by: Kees Cook <[email protected]> Link: https://lore.kernel.org/r/[email protected]
bignaux · Dec 1, 2020 · cbf82e3 · cbf82e3
1 parent 3cea11c
commit cbf82e3
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/fs/pstore/zone.c b/fs/pstore/zone.c
@@ -1299,6 +1299,10 @@ int register_pstore_zone(struct pstore_zone_info *info)
 		pr_warn("total_size must be >= 4096\n");
 		return -EINVAL;
 	}
+	if (info->total_size > SZ_128M) {
+		pr_warn("capping size to 128MiB\n");
+		info->total_size = SZ_128M;
+	}
 
 	if (!info->kmsg_size && !info->pmsg_size && !info->console_size &&
 	    !info->ftrace_size) {