git: 0c0e08be01a7 - stable/15 - diff: handle read(2) failures

The branch stable/15 has been updated by bapt:

URL: https://cgit.FreeBSD.org/src/commit/?id=0c0e08be01a755061eff1f85e7f8bed966fbe0bf

commit 0c0e08be01a755061eff1f85e7f8bed966fbe0bf
Author:     Baptiste Daroussin <bapt@FreeBSD.org>
AuthorDate: 2026-03-26 09:25:21 +0000
Commit:     Baptiste Daroussin <bapt@FreeBSD.org>
CommitDate: 2026-04-06 16:51:46 +0000

    diff: handle read(2) failures
    
    MFC After:      1 week
    
    (cherry picked from commit 9b98c4b053917cad42e26596b37df72efab6dc39)
---
 usr.bin/diff/diffreg.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/usr.bin/diff/diffreg.c b/usr.bin/diff/diffreg.c
index 8dcf55a7190b..5c1147bf2730 100644
--- a/usr.bin/diff/diffreg.c
+++ b/usr.bin/diff/diffreg.c
@@ -542,6 +542,11 @@ opentemp(const char *f)
 			return (NULL);
 		}
 	}
+	if (nread == -1) {
+		close(ifd);
+		close(ofd);
+		return (NULL);
+	}
 	close(ifd);
 	lseek(ofd, (off_t)0, SEEK_SET);
 	return (fdopen(ofd, "r"));