It __bitmap_shift_left() is asked to shift by a multiple of BITS_PER_LONG, it will try to shift a long value by BITS_PER_LONG bits which is undefined. Change the function to take this into account. Coverity-id: 1192175 CC: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx> CC: stable@xxxxxxxxxxxxxxx Signed-off-by: Jan Kara <jack@xxxxxxx> --- lib/bitmap.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/lib/bitmap.c b/lib/bitmap.c index cd250a2e14cb..02a8a439fcc7 100644 --- a/lib/bitmap.c +++ b/lib/bitmap.c @@ -172,7 +172,9 @@ void __bitmap_shift_left(unsigned long *dst, upper = src[k]; if (left && k == lim - 1) upper &= (1UL << left) - 1; - dst[k + off] = lower >> (BITS_PER_LONG - rem) | upper << rem; + dst[k + off] = upper << rem; + if (rem) + dst[k + off] |= lower >> (BITS_PER_LONG - rem); if (left && k + off == lim - 1) dst[k + off] &= (1UL << left) - 1; } -- 1.8.1.4 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html