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-rw-r--r--libbb/read.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/libbb/read.c b/libbb/read.c
index 1c2945f45..b3648b4d7 100644
--- a/libbb/read.c
+++ b/libbb/read.c
@@ -86,7 +86,8 @@ char *reads(int fd, char *buffer, size_t size)
if (p) {
off_t offset;
*p++ = '\0';
- offset = (p-buffer) - size;
+ // avoid incorrect (unsigned) widening
+ offset = (off_t)(p-buffer) - (off_t)size;
// set fd position the right after the \n
if (offset && lseek(fd, offset, SEEK_CUR) == (off_t)-1)
return NULL;