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D55503.diff
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diff --git a/usr.bin/rev/rev.c b/usr.bin/rev/rev.c
--- a/usr.bin/rev/rev.c
+++ b/usr.bin/rev/rev.c
@@ -83,7 +83,7 @@
putwchar(*t);
putwchar('\n');
}
- if (ferror(fp)) {
+ if (fp != NULL && ferror(fp)) {
warn("%s", filename);
clearerr(fp);
rval = 1;
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D55503: rev: defensive null check for fp
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