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-rw-r--r--libio/filedoalloc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libio/filedoalloc.c b/libio/filedoalloc.c
index 4f9d738968..ded0725356 100644
--- a/libio/filedoalloc.c
+++ b/libio/filedoalloc.c
@@ -94,7 +94,7 @@ _IO_file_doallocate (_IO_FILE *fp)
fp->_flags |= _IO_LINE_BUF;
}
#if _IO_HAVE_ST_BLKSIZE
- if (st.st_blksize > 0)
+ if (st.st_blksize > 0 && st.st_blksize < _IO_BUFSIZ)
size = st.st_blksize;
#endif
}