From: Paul Eggert <eggert@cs.ucla.edu>
Date: Sat, 6 Apr 2024 22:15:04 +0000 (-0700)
Subject: dd: don’t trust st_size on /proc/files
X-Git-Tag: v9.6~258
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ac6b8d8224de140f5a6f2ca66e6ce279604a37e6;p=thirdparty%2Fcoreutils.git

dd: don’t trust st_size on /proc/files

* src/dd.c (skip): Don’t trust st_size == 0.
---

diff --git a/src/dd.c b/src/dd.c
index 370a42c975..6e0d725da5 100644
--- a/src/dd.c
+++ b/src/dd.c
@@ -1809,7 +1809,7 @@ skip (int fdesc, char const *file, intmax_t records, idx_t blocksize,
            struct stat st;
            if (ifstat (STDIN_FILENO, &st) != 0)
              error (EXIT_FAILURE, errno, _("cannot fstat %s"), quoteaf (file));
-           if (usable_st_size (&st) && 0 <= input_offset
+           if (usable_st_size (&st) && 0 < st.st_size && 0 <= input_offset
                && st.st_size - input_offset < offset)
              {
                /* When skipping past EOF, return the number of _full_ blocks