From: Tobias Stoeckmann <tobias@stoeckmann.org>
Date: Sat, 18 Apr 2026 16:17:13 +0000 (+0200)
Subject: fallocate: Add range check
X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=da32ad3ded0a53615b928014d5fd004c55bfee28;p=thirdparty%2Futil-linux.git

fallocate: Add range check

Make sure that offset + length does not overflow off_t.

Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>
---

diff --git a/sys-utils/fallocate.c b/sys-utils/fallocate.c
index 622e0c39c..ff063fcd5 100644
--- a/sys-utils/fallocate.c
+++ b/sys-utils/fallocate.c
@@ -479,6 +479,10 @@ int main(int argc, char **argv)
 		if (length == 0)
 			errx(EXIT_FAILURE, _("invalid length"));
 	}
+	if (length > SINT_MAX(off_t) - offset) {
+		errno = ERANGE;
+		err(EXIT_FAILURE, _("invalid range specified"));
+	}
 
 	/* O_CREAT makes sense only for the default fallocate(2) behavior
 	 * when mode is no specified and new space is allocated */