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8511a653e9
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:
|
||
|---|---|---|
| .. | ||
| alloc.c | ||
| catas.c | ||
| cmd.c | ||
| cq.c | ||
| crdump.c | ||
| en_clock.c | ||
| en_cq.c | ||
| en_dcb_nl.c | ||
| en_ethtool.c | ||
| en_main.c | ||
| en_netdev.c | ||
| en_port.c | ||
| en_port.h | ||
| en_resources.c | ||
| en_rx.c | ||
| en_selftest.c | ||
| en_tx.c | ||
| eq.c | ||
| fw_qos.c | ||
| fw_qos.h | ||
| fw.c | ||
| fw.h | ||
| icm.c | ||
| icm.h | ||
| intf.c | ||
| Kconfig | ||
| main.c | ||
| Makefile | ||
| mcg.c | ||
| mlx4_en.h | ||
| mlx4_stats.h | ||
| mlx4.h | ||
| mr.c | ||
| pd.c | ||
| port.c | ||
| profile.c | ||
| qp.c | ||
| reset.c | ||
| resource_tracker.c | ||
| sense.c | ||
| srq.c | ||