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author | Jack Morgenstein <jackm@dev.mellanox.co.il> | 2018-05-02 13:04:25 +0300 |
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committer | Doug Ledford <dledford@redhat.com> | 2018-05-03 22:31:43 +0300 |
commit | b03bcde962606d2ee59a4e9dd470db9ad53c5418 (patch) | |
tree | 38e6e9ed39cebf666f2595b3afb5a1669e0ce87b /net/9p/Kconfig | |
parent | 59482a14918b282ca2a98f38c69da5ebeb1107d2 (diff) | |
download | linux-b03bcde962606d2ee59a4e9dd470db9ad53c5418.tar.xz |
IB/mlx4: Fix integer overflow when calculating optimal MTT size
When the kernel was compiled using the UBSAN option,
we saw the following stack trace:
[ 1184.827917] UBSAN: Undefined behaviour in drivers/infiniband/hw/mlx4/mr.c:349:27
[ 1184.828114] signed integer overflow:
[ 1184.828247] -2147483648 - 1 cannot be represented in type 'int'
The problem was caused by calling round_up in procedure
mlx4_ib_umem_calc_optimal_mtt_size (on line 349, as noted in the stack
trace) with the second parameter (1 << block_shift) (which is an int).
The second parameter should have been (1ULL << block_shift) (which
is an unsigned long long).
(1 << block_shift) is treated by the compiler as an int (because 1 is
an integer).
Now, local variable block_shift is initialized to 31.
If block_shift is 31, 1 << block_shift is 1 << 31 = 0x80000000=-214748368.
This is the most negative int value.
Inside the round_up macro, there is a cast applied to ((1 << 31) - 1).
However, this cast is applied AFTER ((1 << 31) - 1) is calculated.
Since (1 << 31) is treated as an int, we get the negative overflow
identified by UBSAN in the process of calculating ((1 << 31) - 1).
The fix is to change (1 << block_shift) to (1ULL << block_shift) on
line 349.
Fixes: 9901abf58368 ("IB/mlx4: Use optimal numbers of MTT entries")
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'net/9p/Kconfig')
0 files changed, 0 insertions, 0 deletions