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| author | Jack Morgenstein <jackm@dev.mellanox.co.il> | 2019-03-12 18:05:49 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-03-19 15:14:09 +0300 |
| commit | f46dc1577e0ca92b0bb8be8ab061dcdc89706fb5 (patch) | |
| tree | 96af4eec5eae470e3da97116c2823e161e3dc649 /drivers/net | |
| parent | 038a48c3714e5e05394a8794ebe81752244494d3 (diff) | |
| download | linux-f46dc1577e0ca92b0bb8be8ab061dcdc89706fb5.tar.xz | |
net/mlx4_core: Fix qp mtt size calculation
[ Upstream commit 8511a653e9250ef36b95803c375a7be0e2edb628 ]
Calculation of qp mtt size (in function mlx4_RST2INIT_wrapper)
ultimately depends on function roundup_pow_of_two.
If the amount of memory required by the QP is less than one page,
roundup_pow_of_two is called with argument zero. In this case, the
roundup_pow_of_two result is undefined.
Calling roundup_pow_of_two with a zero argument resulted in the
following stack trace:
UBSAN: Undefined behaviour in ./include/linux/log2.h:61:13
shift exponent 64 is too large for 64-bit type 'long unsigned int'
CPU: 4 PID: 26939 Comm: rping Tainted: G OE 4.19.0-rc1
Hardware name: Supermicro X9DR3-F/X9DR3-F, BIOS 3.2a 07/09/2015
Call Trace:
dump_stack+0x9a/0xeb
ubsan_epilogue+0x9/0x7c
__ubsan_handle_shift_out_of_bounds+0x254/0x29d
? __ubsan_handle_load_invalid_value+0x180/0x180
? debug_show_all_locks+0x310/0x310
? sched_clock+0x5/0x10
? sched_clock+0x5/0x10
? sched_clock_cpu+0x18/0x260
? find_held_lock+0x35/0x1e0
? mlx4_RST2INIT_QP_wrapper+0xfb1/0x1440 [mlx4_core]
mlx4_RST2INIT_QP_wrapper+0xfb1/0x1440 [mlx4_core]
Fix this by explicitly testing for zero, and returning one if the
argument is zero (assuming that the next higher power of 2 in this case
should be one).
Fixes: c82e9aa0a8bc ("mlx4_core: resource tracking for HCA resources used by guests")
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx4/resource_tracker.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c b/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c index 9d1a7d5ae835..79944302dd46 100644 --- a/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c +++ b/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c @@ -2677,13 +2677,13 @@ static int qp_get_mtt_size(struct mlx4_qp_context *qpc) int total_pages; int total_mem; int page_offset = (be32_to_cpu(qpc->params2) >> 6) & 0x3f; + int tot; sq_size = 1 << (log_sq_size + log_sq_sride + 4); rq_size = (srq|rss|xrc) ? 0 : (1 << (log_rq_size + log_rq_stride + 4)); total_mem = sq_size + rq_size; - total_pages = - roundup_pow_of_two((total_mem + (page_offset << 6)) >> - page_shift); + tot = (total_mem + (page_offset << 6)) >> page_shift; + total_pages = !tot ? 1 : roundup_pow_of_two(tot); return total_pages; } |